Add animation to OxygenGenerator
Add inventory to OxygenGenerator with a few empty OxygenTanks
Fix nasty, rare exception in Entity:includesPoint
Fix bug in OxygenTank:setQuad with 0 oxygen and set the oxygen in a new OxygenGenerator to 0
Update Quickie
Add state as argument to all element and registerDraw
Use buttons to switch between other nearby inventories when on the exchange view