Merge branch 'bug-2163-support-external-mitk-projects'
- bug-2163-support-external-mitk-projects: Added MacOS tweaks for installing third-party plug-ins. Added plugins dir to LD_LIBRARY_PATH in start script. Fix plug-in install dir on MacOS. Remove RPATH entries from installed external plug-ins. Use only CMake variables which are available to external projects. Handle all plug-ins at once during CMake installation. The mitkFunctionGetVersion CMake function can now handle multiple VCSs. Improved stability and error tolerance of FindGit script. Pass cmd line args from the Linux shell script to the executable. Correctly read installed provisioning files. Added missing CMake scripts for external MITK projects. Do not use CMAKE_INSTALL_RPATH anymore.