PCA Puzzle 0.3.1 (keyholes and add-on rooms)

New

• Keyholes on locked doors. The middle block of each locked doorway is now a gold plate with a sunken panel showing a dark outline of the item that opens it, so players can see where to click and what they need. Doors that only /puzzle unlock can open show a plain keyhole. Turn it off with doors.keyhole. Doors built with an older version keep plain gold blocks until they're rebuilt.
• Rooms from other mods and datapacks. A room's file in a layout can now be a structure id such as "pcapuzzlerooms:deep_mine", loaded from data/<namespace>/structures/. This is what the new PCA Puzzle Rooms add-on uses.
• Chests with their own loot table. A chest saved with its own loot table in a room file keeps it, so one room can have chests with different loot. Existing rooms don't do this, so nothing changes for them.
• Room info for JEI. Each castle room now has a small info file (name, description, items found, items needed) that the new PCA JEI mod shows as JEI pages.

Checked

• Using a key on a locked door still uses it up (except in creative), so each key opens one door.