Fix #553. Nerf the prop spawner.
Fix #553. Nerf the prop spawner.

It now can't spawn props if one of its spawned props is already inside
it, or after a fixed delay (controlled by convar wire_spawner_delay).

mitterdoo/wire,CaptainPRICE/wire,thegrb93/wire,sammyt291/wire,bigdogmat/wire,Python1320/wire,plinkopenguin/wiremod,Grocel/wire,rafradek/wire,wiremod/wire,notcake/wire,garrysmodlua/wire,dvdvideo1234/wire,immibis/wiremod,NezzKryptic/Wire,mms92/wire