PCA Games 0.5.1 (moving archery targets, maze fix)

New

• Moving targets for Archery Range (off by default). Turn them on in the Shooting Line's settings or with /archery set moving on: during a game the Archery Targets in front of the line slide side to side along their row. Set how fast with /archery set moving speed <1-10> and how far with /archery set moving distance <1-8> (blocks each way).
• Hits on a moving target still score by ring and still give the redstone pulse.
• Every target goes back to its place when the game ends, is stopped, or the server stops. Where they started is saved in the Shooting Line, so they're put back even after a crash.
• Practice (no game running) stays still.
• /archery info shows the moving target settings.

Fixed

• An auto Maze Generator placed by a structure (a PCA Puzzle room, e.g. Hedge Maze or School Corridors) now builds its maze straight away. Structures load the block's settings after it's placed, so the generator now also checks when its settings load.