Updates spiders to have full player functionality

*All spiders can now web turf (but AI controlled non-nurses won't choose to), only nurse spiders can wrap items and lay eggs.
*Eggs laid by a player controlled nurse spider will eventually grow into player controlled spiders, while AI lain eggs will only result in AI spiders.
*Adds non nurse spiders to the staff of change as they pass my rules for inclusion (Leaves a corpse, can do everything as a player the NPC can do, can't dominate a round by reproduction)

I take no responsibility for spidercode, it's a bit iffy but as far as I can tell it all works for players now.