Changed the String state to SlotMachineMode State

Whenever a command is run (still need the Command API I belive) it will
send a message to the player(or console) on the state of the slot
machine. May need to be able to select a slotmachine similar to
Citizens.
Depending on what the devs at Sponge feel, we may need to slightly
change the code if it is a player of console sending the message(can't
remember if Bukkit did this or not). If not then ignore/delete the
message.