Fixes to improve platform support
- detect XCode in CMake and handle equivalent to Unix environment
- fix problem with glew 1.13 and GL core cotext
- bugfix for potential hangup during app init
Notice to GitKraken users: A vulnerability has been found in the SSH key generation of GitKraken versions 7.6.0 to 8.0.0 (https://www.gitkraken.com/blog/weak-ssh-key-fix). If you use GitKraken and have generated a SSH key using one of these versions, please remove it both from your local workstation and from your LRZ GitLab profile.
21.10.2021, 9:00 - 11:00: Due to updates GitLab may be unavailable for some minutes between 09:00 and 11:00.