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+ Using passthrough.vert and geometryrenderer.frag instead of the meshGeometryRenderer.vert and meshgeometryrenderer.frag
+ adding comments for the destroy function of GeometryTextureInfo and why to use it.
+ Change the depth buffer size changing part of Paint() function in datacontainerinspectorcanvas checking part.
+ Delete the commented codes which are not necessary.
+ Fix the opening braces and removing the redundant parts and only for debugging parts.
+ DVRVis and volumerendererdemo default file is revereted to the original locations.
+ Revert the shaders to the original ones.
+ StartMouseDrag and EndMouseDrag functions of the trackball are replaced with mousePress and mouseRelease.

- Delete the meshGeometryRenderer.vert and meshgeometryrenderer.frag.

Cleaned up and slightly revised GeometryData API. Cleared the way for non-value semantics. Introducing GeometryDataFactory, a collection of static methods to create standard geometric primitives.

+ Moving the geomteryshader vertex and fragment shader to application folder as they belong to it.
+ Removing unndeeded shader code.
+ Opening braces convention is considered for datacontainerinspectorcanvas.cpp and datacontainerinspectorcanvas.h  also.
+ Reusing textues for color and depth buffers instead of creating and deleting them.
+ adding gettrackball function to trackball event handler.
+ modifying resetcontent, mouse events in datacontainerinspectorcanvas class
+ using one depth buffer for datacontainerinspectorcanvas instead of one for every color buffer
+ using one frame buffer for whole datacontainerinspectorcanvas instead of one for every frame

Bugs:
- Invalid Enumerator during the rendering mesh
- Problems in deleting the generated color and depth textures.
- Depth darkening still has problem :(

+ update the get function of abstractproperty.h and abstractproperty.cpp to support the const objects.

- Still sufring from invalid enumerator in meshgeomtery rendering.

+ Adding the functionality to rotate the rendered geomtery objects
+ Adding the functionality to set the rendered mesh by the user

- Still there are bugs with shader that I cannot set the color of the rendered mesh in the shader

# Adding functionality to render the mesh in the DataContainerInspectorCanvas and camera rotating around the object

MdiDockableWindow has been extracted from MdiDockArea to simplify and
better structure our MDI implementation. The new class takes care of
creating all necessary representations (docked and floating window) of
widgets added to MdiDockArea and seamlessly switching between them in
response to the user's actions (window dragging, key presses, etc).

MdiDockableWindow improves our MDI implementation in two ways:
- MdiFloatingWindow and MdiDockedWindow instances shouldn't be
  interacted with directly; they're created and disposed of as needed,
  and therefore can't be used as a handle to access and modify an MDI
  window's state; MdiDockableWindow, in contrast, fits this role
  perfectly; it manages both representations of an MDI window, and as
  a result stays around as long as at least one of them is needed
- managing state transitions of many sub-windows directly in MdiDockArea
  was becoming clumsy as signal mapping and dynamic properties were
  required; having a separate widget that only has to control the state
  of one sub-window makes the code related to state transitions much
  simpler

Closing a docked MDI subwindow caused it to disappear if the MDI area
was in SubWindowView mode, but its inactive tab could still be seen in
TabbedView mode.

If a docked MDI subwindow gets closed, hide it by removing it from the
MDI area.

The "Tools" submenu lists all standard docked tools offered by the
application (i.e. "Pipeline tree", "Pipeline properties", and "Log
viewer"), and lets the user toggle their visibility.

This commit adds a simple main menu to the application. For the time being
it only has 2 submenus, "File" and "Visualizations". The latter is created
by MdiDockArea and lets users manage the visibility and placement of
canvas windows.

# Fixing the bugs of the Color Window in the Canvas

# use 4 spaces instead of tab
# use QString operations instead of unsafe C String operations
# use static_cast casting instead of C casting

# Adding the color under the mouse cursor window and the color value in a line into the Data Inspector Widget.

# Take back the updateInfoWidget to its previous position and add a new updateColor function to just update the Color in the label.

# Add the ability to read the color when hovering the mouse into the canvas and dragging the right mouse button.

# Make a pointer from datacontainerinspectorwidget into datacontainerinspectorcanvas, as we need to call the updateInfoWidget() after updating the color.

# Make the updateInfoWidget() as public to be able to call it.

# Add the Capability to look up the color under the mouse button when one of the mouse buttons is pressed.

In its destructor, LogHighlighter first of all deleted its filter regex
explicitly, and then called `setFilterRegExp(0)`, triggering a second —
this time somewhat implicit — delete. If the filter regex pointer was
not NULL, this caused the application to crash due to a double-free.

Fix this error by not invoking `setFilterRegExp` in LogHighlighter's
destructor; the explicit delete performs the same cleanup as
`setFilterRegExp` anyways.

 * fixed 1D geometry TF editor
 * introduced OptionProperty to specify gradient computation mode
 * added s_changed signal of properties also being propagated to its shared properties
 * fixed sampling rate compensation when using adaptive sampling in simpleraycaster.frag

# use 4 spaces instead of tab
# use QString operations instead of unsafe C String operations
# use static_cast casting instead of C casting

# Adding the color under the mouse cursor window and the color value in a line into the Data Inspector Widget.

# Take back the updateInfoWidget to its previous position and add a new updateColor function to just update the Color in the label.

# Add the ability to read the color when hovering the mouse into the canvas and dragging the right mouse button.

# Make a pointer from datacontainerinspectorwidget into datacontainerinspectorcanvas, as we need to call the updateInfoWidget() after updating the color.

# Make the updateInfoWidget() as public to be able to call it.

# Add the Capability to look up the color under the mouse button when one of the mouse buttons is pressed.

Fixed missing/wrong deregistration of GeometryXdTransferFcuntionEditors when their widgets are closed (and hence the GL contexts destroyed)

Fixes -Wswitch

Previously, when an MDI window was being dragged very fast and its state
changed from docked to floating (or vice versa), it wouldn't be placed
under the cursor, but instead some way behind it (with regards to the
drag direction). This happened because we decided where to place the
window's based on its last position in its previous state. Now we use
the cursor's position to calculate the window's new position, which
fixes the problem.

PipelineMdiSubWindow has been renamed MdiDockedWindow, and
refactored to make it easier to use it with arbitrary widgets.

To better group MDI-related classes, all of them have been moved to the
´gui/mdi´ directory.

VisualizationPipelineWidget has been renamed MdiFloatingWindow, and
refactored to make it easier to use it with arbitrary widgets.

VisualizationPipelineWrapper has been renamed MdiDockArea, and refactored
to make it easier to use it with arbitrary widgets. It now inherits from
QMdiArea, which removes an unnecessary layer of indirection. Moreover, it
creates MDI subwindows and floating windows only if necessary, i.e. when
a widget stored in it changes state.

Work on Issue #44: Removed GLContext interface and merged functionality into GlCanvas. Introducing abstract (Qt-free) tgt::GlContextManager interface, being implemented by tgt::QtContextManager. Further clean up of related code.