OpenGL2: Use ri.Error instead of Com_Error in tr_vbo.c
Fix Team Arena server refresh time format
Fix -1 (unlimited) ammo decreasing ammo time remaining
Correct spelling mistakes
Fix invalid model frame developer warnings in Team Arena
Getting value of non-existant cvars in menu in ioquake3 will be 0. Flipping the logic for fs_pure allows changing sv_pure in the menu when running on unmodified ioquake3 engine (which lacks fs_pure/fs_unpure so they are treated as 0).
This breaks compatiblity with older Q3RallySA UI VM. Though I recently broke compatibility with older Q3RallySA CGame/Game VMs to restore ioq3 compatibility anyway (removed asin/cos system calls).