crated backup of CMakeLists.txt (CMakeLists.MediTEC.txt),
started refactoring CMakeLists.txt
fixed Qt dependency in CMakeLists.txt
wip on CMakeLists.txt: GLEW look-up working
wip on CMakeLists.txt: TRTK support added
added FindEigen3.cmake and FindGDCM.cmake, refactored FindTRTK.cmake, s.t. it sticks closer to the idea of CMake
Fixed CMakeLists.txt and FindTRTK.cmake s.t. project can be built now. GDCM support not finished yet.
Merge branch 'master' of https://github.com/RWTHmediTEC/Carna