Made the interaction button work. Doesn't handle multiple items yet though.
Correctly calculate the area of a room's floor...
Merge commit '904f75ea66c40bd58904024e2bf5f97a18dbdb16'

Conflicts:
	src/Entity.swift
Moves action handling to the Game, makes interaction an action
Merge branch 'master' of https://github.com/arubinoff/iRogue

Conflicts:
	Mob.swift