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This reverts commit e7e55015.

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

* 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

* 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.

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

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.

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)

* 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

* 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.

* 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

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

* 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

Fixed usage of GL_CLAMP wrapping mode for OpenGL textures. This mode is deprecated since OpenGL 3.1. Replaced all its occurrences with CLAMP_TO_EDGE, which usually is the wanted behavior. This also seems to improve the performance of the AdvOptimizedRaycaster.

* Fixed deadlock in VolumeRenderer when changing the RaycastingProcessor
* Fixed compile error in ITK module
* Fixed some gcc warnings
* Fixed usage of deprecated ScopedSynchronousGlJobExecution in mainwindow.cpp

refs #249

* Updated all CMake scripts to use Qt5
* CampvisApplication takes care of moving the QGLContext thread affinity to the threads that do the rendering.
* QtCanvas:resize() is called through Qt signalling to ensure being in GUI thread.
* Added init and deinit functions to the Runnable interface.
* minimum required CMake version is now 3.0

refs #249

* Replaced Lua Git submodule with our own adjusted copy of the Lua source + CMakeLists.txt. This allows to export liblua as installation target.
* The campvis-application library is now called campvis-application-lib. The executable is called campvis-application.
* Further clean up of CMake files.

refs #643

* Added DISOWN typemaps to various functions, where CAMPVis takes ownership of passed pointers. This prevents the Lua garbage collector from deleting those items.
* Improved sigslot bindings to also support pass-by-value signal arguments.
* Changed import type of campvis.i from #include to #import

refs #643

Added a field _pipelineName to AutoEvaluationPipeline. This allows to implement AutoEvaluationPipeline::getName() so that AutoEvaluationPipeline is no longer abstract. Consequently, the LuaPipeline is no longer needed.

This change was also used to change the AbstractPipeline constructor signature to pass-by-reference instead of pass-by-pointer for the pipeline's DataContainer. This presents the semantics more clearly since the DataContainer must not be 0.

* campvis::deinit() also deinitializes PipelineFactory and ProcessorFactory
* Fixed signal_manager::waitForSignalQueueFlushed() returning too early -> fixes occasionally failing AbstractProcessorTest
* Fixed signal_manager::waitForSignalQueueFlushed() waiting for ever in case that the wake-up of signal_manager fails

Introducing free campvis::init() and campvis::deinit() functions that take care of initializing all cgt and campvis-core stuff properly and tearing everything down in the correct order again.

Renamed CampvisPainter to PipelinePainter. The PipelinePainter now directly belongs to the corresponding AbstractPipeline, which also owns the pointer and takes care of creating, (de-)initializing and destroying it.

Cleaned up CMake scripts and added correct export definitions so that now CAMPVis can easily imported into other CMake projects through FIND_PACKAGE(CAMPVis).