Make teleporters have an inventory

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Was messing around to see what I could get away with while using teleporters. I wanted to automatically put a shard in via a ComputerCraft computer (the peripheral API supports generic inventories). I couldn't because I assume that the block entity only accepts items through the right click of the block. If I have the time I'll see to making a PR, but wanted to mention it first in case someone could beat me to the punch.