cleanup the VBO changes
note, GetId() should be const to be callable in a const method
Lua: fix Game.version
It now returns only the core version (e.g. "91.0") w/o additional flags (" (OMP)", " (MT-Sim)"), cause it is the table is created in synced context too and buildflags don't sync ;)
-> it caused a sync error in ZK
reduce default GrassDetail again for performance reasons
changelog++