Survivor utility belt use action

Survivor utility belt is crafted from following tools that have their
own use action - sheath, hammer, hacksaw and wood saw. Only one action -
SHEATH_KNIFE is currently useable.

I made new action SURVIVOR_BELT, which allows player to choose one of
these:
Sheathe a knife / Unsheathe a knife (depends on if knife is sheathed)
Use hammer
Use hacksaw
Use wood saw