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Somehow I messed up the cherrypick/merge history.
Stereo module provides basic processors for a compositor and a camera
generator to generate stereo images.

(cherry picked from commit 00cdb42948e45681b5cde12629f6970b906b0eec)

(cherry picked from commit b4033e899e318707a732203584c6aee0d9c178c8)

# Conflicts:
#	modules/stereo/processors/stereocameragenerator.cpp

This reverts commit e7e55015.

# Conflicts:
#	core/glsl/tools/shading.frag

* OpenGL core context is instantiated and enforced, for better forward compat
* Fixed DLL deployment to RelWithDebInfo and MinSizeRel configurations
* Bumped GLEW to 2.0.0
* Fixed wrong shading in various raycasters (normal was wrong sign)

Squashed commit of the following:

commit 21b33709371459552aff972124e9da4ae0077cf4
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Mon Feb 6 15:21:12 2017 +0100

    Fixed number of texture unit query

commit 6592f366c7f24822a8681401cf5a415a622e5f6e
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Mon Feb 6 14:27:36 2017 +0100

    Fixed core profile requirements

    * now using Framebuffer ARB version instead of EXT
    * fixed extension handling and windows version recognition
    * Removed pixel transfer functions usage and some validity checks for vis pipelines

commit 36c82733434e63309d092bf85f78f471b56bebfb
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Mon Feb 6 13:50:08 2017 +0100

    Bumped glew to 2.0.0

commit 4a4a1d51756aad0e19aef9e723e1dfe7d07a797d
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Fri Feb 3 16:26:07 2017 +0100

    First Progress - WIP

# Conflicts:
#	ext/cgt/texturemanager.cpp

For some reason, devIL was completely checked in with campvis-public, so we stick to checking in the (customized) windows binaries for now

Stereo module, extended DevilImageReader with builtin filters, minor fix to PredicateDemoSmallHeart pipeline

Attempted colored shadows, but this does not give correct results yet.

* Based on DevIL 1.8.0, built with libjpeg 9.1, libpng 1.6.69, libsquish 1.15, libtiff 5.2.5, openexr 2.2.0, zlib 1.2.11
* Manual patch fixes problem with paletted BMPs (see https://github.com/DentonW/DevIL/issues/56)
* DevIL only built for win64, win32 is considered deprecated as of right now :)

* Light sources now have an additional camera input. If this is set, the light source position is relative to the camera coordinate system
* ImageMappingInformation and Texture3D now supply an additional pair of matrices: textureToWorldMatrixInvTransp to transform normals between world and texture space

* glImageResampler now sets the mapping information correctly
* ImageData now asserts that an associated imagemappinginformation has the
  same dimensionality

* datacontainerinspector can now display alpha-channel only in a meaningful way
* new method in stringutils to display bytes in a humanly readable form
* depth darkening has slightly increased range for lambda
* satisfied formatting OCD

* Added more supported file formats to DevilImageReader and DevilImageWriter
* Added more supported formats for datacontainerinspectorwidget.cpp export to file

* Updated TextureManager
* Fixed some warnings and minor cleanup

* 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

* 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

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.

* 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!

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.