* gradient computation now properly accounts for anisotropic voxels
* Shaders that fail to compile at startup result in an error on the console, with the option to retry computation (after editing the shader) instead of crashing campvis completely

* 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

* texturemanager documentation and parameter fix
* imagerepresetation conversion fix for channel number mismatch

TextureManager now uses a configurable lifetime for the lifetime of a cache object. Upon every garbage collection event, the counter is incremented for each object in the cache and if a counter exceeds TextureManager::garbageLifetime, the texture id is marked for deletion.
Deletion now happens in a separate thread, as a job enqueued to the OpenGLJobProcessor, in order to properly acquire a valid opengl context.

* AbstractPipeline now does explicit GPU timing, implying a Flush of the OpenGL pieline after every processor
* OptionProperty has an extended constructor directly using initializer lists of GenericOption<>'s
* ImageMappingInformation has somehow extended / more complete interface allowing copies and default construction

* Added .editorconfig
* cgt::Texture::downloadTextureToBuffer now does a glFlush() before downloading
* ColorPropertyWidget now supports transparent colors properly

* minor whitespace fix in mainwindow.cpp

Note: The googletest directory included has been modified from the original release: The CMakeLists.txt has been adapted and gmock and some other unnecessary folders have been removed.

* 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

Now spawns a garbage collection thread that periodically clears the cache. Still not optimal but at least gets rid of unused memory at some point. For next iteration, a "smart" garbage collection (time- or query based heuristic)

* 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

# 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