UPD: .inl files will be added as source files by GenerateCMakeProjectFiles.py

UPD: .inl files will be installed along with .h files
CHG: re-enabled installing of headers in release mode (no clue why this was disabled)

git-svn-id: https://svn.rwth-aachen.de/repos/vrgroup-svn/projects/VistaCMakeCommon/trunk@49538 33c38b33-09d2-4561-8d4d-1bfa2f58f885