Don't use va() in FS_DeleteDir

va() causes weird bugs sometimes, try to avoid possible issues with name of file to delete.
Use trap_Cvar_SetValue more

Started out just replaing trap_Cvar_Set that used va() for a number, but changed most the ones that were a string constant of number too.
Clean up G_InitBots setting fraglimit and timelimit
Fix setting CVAR_VM_CREATED flag on user created cvars

Fix setting CVAR_VM_CREATED flag on cvars created using set[asu] commands (including archived cvars from cfg) and trap_Cvar_Set.

trap_Cvar_Register called Cvar_Get which cleared CVAR_USER_CREATED flag, but CVAR_VM_CREATED wasn't set because the cvar already existed.
Merge remote-tracking branch 'ioquake3/master'
Add trap_Cvar_CheckRange to game and cgame/ui

It can be used to keep value of a cvar in a range and show a warning for invalid values.
Use trap_Cvar_CheckRange in game, cgame, and ui
Fix vis_dummy_multiple