Conflicts:
	application/gui/mainwindow.cpp

Neuro project cleaned

See merge request !109

Introducing ViscontestDemo pipeline showing an example rendering of multi-volume ray casting and combined fiber rendering.

* Fixed FiberReader parsing TrackVis files with additional scalars
* Fixed off-by-one error in StringUtils::split()
* Fixed VoxelHierarchyMapper support for non quadratic base sizes.

* MultiIndexedGeometry supports instanced rendering
* FontAtlas supports writing picking information

* Fixed wrong picking in ViewportSplitter
* Let QuadRenderer have two quads to render, one with [-1, 1] coordinates, one with [0, 1] coordinates
* Fixed the recent fix in StringUtils (commit: fe48b9778e)
* Added stringsafe support in TextFileParser
* fixed cgt::minElem
* fixed Doxygen in fontrendering::FontAtlas

Introducing DTI module with FiberReader, FiberTracker and FiberRenderer processors (code base copied over from columbia module branch, generalized and fit into the DTI module).

Adapted CsvdImageReader and MhdImageReader to the new API.

Further work on neuro project, making use of ViewportSplitter, fixing MultiVolumeMprRenderer shader.

Introducing ViewportSplitter class to campvis-core, a nice proxy class to support splitting the viewport into multiple views.

When rapidly switching between processors in the tree view, the
PropertyCollectionWidgets would sometimes cause the program to crash. This
happened because some signals originated from a different Thread and
sometimes caused a user-after-free error on the widget objects.

Introducing MultiVolumeMprRenderer processor, rendering a slice through up to 3 co-registered images at the same time. Updated NeuroDemo pipeline and implemented picking of MPR plane.

* Fixed MSVC warning in mainwindow.cpp

* Included VoxelHierarchyMapper for empty space skipping
* Now can successfully render three volumes at the same time.

Adv raycaster

See merge request !108

Who would have thought that active mip-mapping during rendering creates such artifacts...

Replaced all occurrences of GL_POLYGON render mode with GL_TRIANGLE_FAN since GL_POLYGON is deprecated.

* Added nullptr check to sigslot::signal::processSignal() (workaround to improve stability even though it should be redundant)

Shared libs support

See merge request !106