Feature/#181 mac problems linking dependencies

closes #181

Required fixes in conan recipes:

assimp (VR-Group/conan-recipes@7410d6c1b11527f0c08bba4e25619be284c8795f)

• now copies symlinks to dylibs correctly
• now appends debug d suffix to target on MacOs

assimp (VR-Group/conan-recipes@f205f013b22e441522003d70985112b6703daf0e)

• fixes windows compile errors

glew (VR-Group/conan-recipes@36d5197ad839dbadfe29a9d7c5e410e0e803665e)

• now does not add @rpath prefix on library generation anymore