-replaced empty string assignments with string_null
-updated getNetname to return string_null on default
-made getNetname not override a set netname
-updated worldtype dependant netnames for keys in getNetname
-removed a supurfluous check for netnames in dropBackpack
	that was added because I clearly cannot read

-updated the call to getNetnames in setItems()
	to check bot self.items and self.weapons
	before it was only checking self.items

-fixed incorrectly set self.weapons in weapon spawns
	which were most likely incorrectly set by me :x

-added getMapname(), and called it from putClientInServer() for fun.

Signed-off-by: gnounc <gnounc@gmail.com>