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Experimental PrisonMines 1.1

This update fixes placeholderapi support for mines.
Adds these config options:

- Prefix (add your own prefix to chat messages)
- interval between automatic resets (in seconds)
- whether to only replace air blocks when resetting
- Form messages

LuckyBlocks!! (optional)
Follow demo config to add your own rewards!
Add a sponge to your mine and break it!!