Make model-node ownership explicit, matching simgear's ref_ptr sweep
Use osg::ref_ptr more strictly in SGModelLib, matmodel and SGBuildingBin
Fix for IAX user-after-free / race
Add dependencies for new Pango text element
Add Nasal ghost for the new pangotext Canvas element
Remove Homebrew FreeType
Re-enable macOS x64 builds
Catch invalid VG_HANDLE in CanvasPath