PCA Puzzle Rooms 0.3.0 (sports day)

New: four rooms for the new PCA Games 0.5.0 games

• Gym Climbing Wall: a parkour course up a tall gym (Parkour Start, two Checkpoints and a Finish pad). The finish is in a gap at the top of the wall, and climbing through it is the only way to the exit, so no lock is needed. Falling off sends you back to your last checkpoint, and best times are kept for the course "Gym Climbing Wall".
• Archery Hall: three Archery Targets in a hay wall and a Shooting Line. Take the bow and arrows from the chest by the door and hit all three bullseyes to open the exit. Each bullseye is remembered by hidden redstone behind the wall (a ring hit doesn't count), and the iron door opens once all three are hit.
• Hedge Maze: oak leaf hedges on grass, with a Maze Generator that builds a different maze every time the room is built. Treats in some dead ends, lanterns on the walls.
• School Corridors: a much bigger maze with white school walls, also new every build.
• The maze rooms start their own maze when they're built (with a hidden Maze Starter), so they work with PCA Games 0.5.0 as it is.
• New example layout, Sports Day (example_sports_day, 115×95): Gym Climbing Wall → Archery Hall → Hedge Maze → School Corridors → Treasury.

Changed

• The four new rooms need PCA Games 0.5.0 or newer. Without it, /puzzle validate says so and /puzzle build refuses the layout, instead of building rooms with missing blocks. The older rooms are unchanged.