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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)

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

* Remove explicit use of Qt::QueuedConnection. As it turns out, when the
  event is emitted by a thread, different from the GUI thread, it is
  automatically enqueued.
* use #ifdef instead of #if

this avoids having to const_cast constant buffers before passing them as
input o the function

* 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

* Added new common base class RunnableWithConditionalWait that directly includes the std::condition_variable
* RunnableWithConditionalWait::stop() notifies the condition variable repeatedly as long until the thread has stopped. This avoids program hangs at shutdown due to race conditions.

* cleaned up cgt::Texture's constructors: only two left - to create an empty texture or a non-empty one
* cgt::Texture will no longer hold a copy of the image data in local memory
* removed a lot of redundant/confusing methods
* no longer needed to call uploadTexture() even though you don't want to upload sth.
* Adapted all known code to the new interface
* Removed cgt::TextureReaderDevil

refs #613

* Introducing cgt::Matrix4<T>::getXYZRotation() (one method for each X, Y, Z)
* Introducing cgt::Matrix4<T>::getTranslationPart()

* Added GL_UNIFORM_BUFFER and GL_SHADER_STORAGE_BUFFER targets to cgt::BufferObject

* Introducing DataSeries type (like ImageSeries but holding AbstractData, ImageSeries should be replaced some time)
* Fixed cgt::dmatX typedefs

Both classes now have a mutex protecting its shared fields. One global mutex may not be the most efficient implementation but at least is reliable and easy to follow.

closes #598

Conflicts:
	core/bindings/campvis.i

Fixed Cppcheck issue in mprrenderer.cpp
Updated visual regression testing reference images (checked)

refs #141

refs #141

Further work on refactoring the camera API. Added proof-of-concept implementation into MprRenderer and MprDemo. Thereby fixed various issues of the new CameraData API that occured:
* tgt::Navigation::updateClippingPlanes() yielding NaNs if the scene bounds were not defined
* NumericProperty yielding endless loops in case of NaN values
* Updated AbstractProcessor::process() to automatically validate level XYZ after calling updateXYZ().
* Adapted changes through renaming tgt into cgt

refs #141
refs #386

refs #386

refs #386

refs #386

refs #386

refs #386