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

* 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

Added usage of VoxelHierarchyMapper to IpsviRaycaster to enable empty space skipping and thereby further improve performance.

Performance improvements for IpsviRaycaster: Illumination cache reduced to single channel texture to reduce needed memory bandwidth.

Further work on IpsviRaycaster. Directional illumination now works quite well. Most artifacts are fixed.

Further work on IpsviRaycaster processor. Projection of light direction seems to work now. First step to introduce extra ray integration step at IC lookup. Results are still mixed though.

Started work on IpsviRaycaster processor implementing ImagePlaneSweepVolumeIllumination by Sundén et al.
- Sweep direction setup works for directional light.
- Computation of illumination cache plane works.
- Implemented simplified version of the IPSVI shader, seems to work to some extent.

PipelineRegistry and ProcessorRegistry are now part of campvis-core. Furthermore, moved all calls to PipelineRegistrar<>/SmartProcessorRegistrar<> to a separate cpp file for each module. This way all registrations are at one central location and including headers in external projects does not lead to double registration.

This commit also removes the obsolete columbia and manualsegmentation modules.

Apparently, glBindAttribLocation() does not work as planned with AMD GPUs. Therefore, all Shaders yielded black images. Replaced all attribute locations with hard-coded ones in the vertex shader and removed corresponding convenience function from cgt::Shader.

refs #382

* Cleaned up unsused code
* Fixed cppcheck issues
* Fixed depth test issues during OrientationOverlay rendering (had glitches in combination with DRRRaycaster)

Fixed duplicate member in OptimizedRaycaster.

Conflicts:
	modules/vis/processors/volumerenderer.cpp

* Fixed signal issues in VolumeRenderer when updating the raycasting processor.
* Fixed assertions in AutoEvaluationPipeline::onPropertyCollectionPropertyAdded() and AutoEvaluationPipeline::onPropertyCollectionPropertyRemoved().

Conflicts:
	modules/vis/processors/volumerenderer.cpp
	modules/vis/processors/volumerenderer.h

Conflicts:
	modules/vis/processors/volumerenderer.cpp
	modules/vis/processors/volumerenderer.h

Issue543: changing raycaster in volumeexplorer: added raycasterfactory, something is going wrong while replacing

Conflicts:
	modules/vis/processors/drrraycaster.h
	modules/vis/processors/simpleraycaster.h

Conflicts:
	modules/vis/processors/volumerenderer.cpp
	modules/vis/processors/volumerenderer.h

* Added TextureReaderTga::loadTextureArray().
* Added OrientationOverlay to VolumeRenderer.

Conflicts:
	application/gui/mainwindow.cpp

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

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 modules/modulesapi.h with CAMPVIS_MODULES_API definition (MSVC __declspec switch)
* Updated modules/CMakeLists.txt to allow shared build
* Added CAMPVIS_MODULES_API to every non-templated class definition in campvis-modules

* Fixed DataSeriesSplitter::updateProperties()
* Fixed VolumeExplorer's camera ID not being dependent on output image name
* Added early return to AbstractProcessor::invalidate(level) if level == 0