Created inert weapon base for hammer made weapons

Weapons using this base:
- Cannot be selected from the player's HUD
- Cannot be dropped or seen in-game
- Switch to "weapon_zs_fists" if switched to forcefully
Added support for hammer made weapons in ZE

- Restricted each player to using only one of these special weapons per
round.
Moved CSSWEAPONS from global to local

There's no reason to have it in globals if it's only used in one place
Merge pull request #26 from BClark09/master

Added support for hammer made weapons and enabled them on ZE