Overhaul

Added InventoryManager class - fixed hide / restore inventory, armor and
exp now
Handles restore of inventory on disconnect now
Removed restriction on floor materials
Replaced rewards and merged into function
Item Randomizer changed to more random. No more floor scanning (Bug
endless loop).
Item Randomizer now returns current Block found with data. (from Byte)
Now allows custom floor schematics
Changed so all block types now accepted in schematics (no more infinite
loop)
Period class overhaul. Functioned out duplicate code.
Leave command moved to Config like join.
Start class added stop command (wip)
Changed logic for schematic randomizer (make it less repeating)
Spectator mode allowed now to queue up players if arena not full.
Disabled commands for player lobby (could enable fly etc)
Disabled so players could not pass power-ups.