* Updated TextureManager
* Fixed some warnings and minor cleanup

# Conflicts:
#	ext/cgt/texture.cpp

Intermediate Commit of Issue #12 "Create Compute Shader Support"

Intermediate commit of working feature for CS support - should be extended to handle proper support though..

See merge request !1

* CSHelper ns contains methods to simplify boilerplate code
* some changes to the cgt::Texture interface
* Shader code now dumped to console when compilation fails (could still use some reworking, i.e. like line numbers)
* updated MedianFilter code

* Adapted cgt::Shader to be able to represent and store CS objects
* cgt::ImageUnit manages the GPU image units in use
* GpuCapabilities has been updated for some related queries
* GLTextureFormatTraits simplify lookup of relevant info for a known internalFormat of a texture

Texture manager manages textures in a cache, for more efficient texture reuse. Currently only clears the cache on program exit, no garbage collection, disabled by default.

* InspectorWindow immediately detaches from the MDI surface
* some swapBuffers warning on first creation of the inspector remains

* increased overall font size
* introduced debugging diagnostic to detect when derived processors do not call AbstractProcessor::[de]init()
* fixed processors not adhering to this
* fixed some tab vs spaces problems

* Debug Feature: Thread names for pipelines and some important active threads show in debugger
* fullscreen can be toggled per pipeline via the pipeline property and via ALT+Return key combination

Colors adapted from https://gist.github.com/QuantumCD/6245215, might need some more work to display all widgets nicely

* MultiIndexedGeometry index type is now 32 bit to allow for larger meshes
* MultiIndexedGeometry::generateVertexNormals() can now automatically generate normals for a GL_TRIANGLES topology

Instance names to (re-)name processor instances individually for UI and discrimination of different instances

# Conflicts:
#	core/pipeline/abstractprocessor.h

Bugfix: EEP Generator now handles arbitrary volume transformations correctly, but might have broken the mirroring feature

# Conflicts:
#	modules/vis/processors/volumeexplorer.cpp

The ProxyGeometryGenerator now correctly generates oriented geometry for
volumes with arbitrary poses by directly using the TextureToWorld matrix
to transform the bounding box instead of just transforming the bounds.

When adding rendered geometr, the EEPGenerator did not unproject the depth value correctly, leading to wrong exit points. The current solution is a more robust solution, but requires an additional texture lookup into the entrypoint color texture. If performance of the EEPGenerator ever becomes a problem, start here by implementing a proper depth unprojection

The background decorator can now blend a texture as well as the color gradient. Currently, at fragments where the texture is (0,0,0,0), it will still use the gradient. Also fixes ProcessorDecoratorBackground::addProperties which did not override AbstractProcessorDecorator::addProperties before due to signature mismatch.

It is now possible to backup and restore 1D transfer functions in a very simple text file format.

* improved filename pattern recognition
* added voxel spacing parameter

Very crude demonstration, mainly to prove that everything compiles and (probably?) works as intended. No writable image representations, hence the weird loopholes to remove the representations from the representations list. No deadlocks! yaay!

Only minimum necessary changes to get image representations to work, no real writable representations.

Access to data entries is now managed through two facilities: DataHandles manage metadata and reference counting to handle memory deallocation properly. ScopedTypedData has been extended to manage threadsafe read/write access to the underlying data.

invalidate() failed for events triggered by sigslot signals, as the makeCurrent() only works from the Qt main thread. Invalidation now goes through the Qt Signals/Slots mechanism to end up in the right thread.

VS15 is warning about dll-exporting a class without exporting its base class, which can be ignored for deriving from STL classes.

Ipsvi raycaster



See merge request !5

Preparation for merge. Added check to IpsviRaycaster whether OpenGL 4.4 is supported to avoid crashes if this is not the case.

Fixed a couple of GCC warnings and CppCheck issues.



See merge request !4

* Disabled LOD-based gradients since their effect is somewhat questionable, they slow down the rendering and lead to artifacts in some case.
* Removed LOD option from ProcessorDecoratorGradient
* Added OpenGL and GLSL versions up to 4.5 to cgt::GpuCapabilities