Updated .classpath and added the core of the mod.
For the most part, this commit adds in the /switch command for switching
between inventories. No inventories are switched as of now, but the command
lays the outline for how they can be switched. Also a big thing is the
permission level for the command. It should be tested on an actual server
and canCommandSenderUseCommand() should be changed, but the current
implementation is the only way that the command will work in single player.
Some digging shows that CommandBase calls canCommandSenderUseCommand() on
the ICommandSender object, which is normally an EntityPlayerMP object, and
this method returns false if it's in single player. So there should be a work
around for this.