Quake 2 8.31RR8 - GL1 multitexture support (by Jaime Moreira), - GL1 big lightmap support (by Jaime Moreira), - Cache QBSP in collision map, - Update SDL 3 support (by Yamagi), - Port train code from ReRelease code, - Fix multimesh models in gl4 render, - Fix quake 1 monsters save, - Improve SiN model support.