Fix server shutdown caused by vid_restart

Don't allocate net fields on the hunk, it gets clears at vid_restart.
Merge CGame and UI VMs (issue 41)

Merge ui VM into cgame VM.
Fix ui_load command.
Remove lerpFrame_t from ui_local.h files, include cg_local.h instead.
Remove UI_DrawProportionalString from cg_drawtools.c, use UI code directly. Team Arena connect screen uses new font now.