Allow Trapped Chests

[Evan Markowitz]

Seems easy enough, allow for trapped chests to be used as an alternative for regular ones to store shop items. Not only will this allow for an increase in shop density (not having the gap between shops) but it will also allow for redstone devices to be made if a thief attempts to open the shop chest (ie. drop them into lava)

[Jason Jones]

support trappedchests, resolves #2

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