Removed unused muzzleflash MZ2_SUPERTANK_GRENADE_x in q_shared.h for both default Lazarus DLL and missionpack DLL.
Added check for filename length before swapping extension to .ent in qcommon/cmodel.c->CMod_LoadEntityString().
Added check for filename length before swapping extension to .pcx in renderer/r_image.c->R_LoadPic().
Added check for filename length before swapping extension to .md3 in renderer/r_model.c->R_RegisterModel().
Changed stats.log to save to savegamedir instead of the Quake2 root folder.
Renamed cvars menu_sensitivity, menu_rotate, and menu_alpha to ui_sensitivity, ui_item_rotate, and ui_background_alpha.
Removed some unused cvars.
Added CVAR_SAVE_IGNORE flag to "game" and "gamedir" cvars.
Added descriptions for most cvars.
Added dumpcvars command to output a list of cvars with their descriptions to cvarlist.txt.
