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* 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

Removed generation of obsolete gen_converterregistration.h file through CMake since converter registration now entirely relies on explicit template specialization.

refs #386

refs #386

* Renamed OpenGLJobProcessor::iKnowWhatImDoingGetArbitraryContext() to OpenGLJobProcessor::getContext()
* Adjusted headers and method calls in various files

refs #474
refs #553

Removed all code fragments in core code that was ITK specific (conversion from/to GenericImageRepresentationItk). The functionality was replaced by the new conversion functors in imagerepresentationconversionitk.h and imagerepresentationconversionitk.cpp.

refs #553
refs #474

Conversions between image representations are now managed at one central place: The ImageRepresentationConverter singleton uses the proven and established registration through static template instantiation idiom to register conversion functors during static initialization. Therefore, the ConversionFunctionRegistrar registers a conversion functor to a target representation type.

As proof-of-concept implementation, the former conversion API through T::tryConvertFrom, where T is a specific image representation, has been converted to the new API and merged into imagerepresentationconversioncore.h providing a conversion functor for each campvis-core representation.

Furthermore, implemented conversion from ImageRepresentationGL to GenericImageRepresentationLocal<>.

refs #553
refs #474