Pre - Release 22 (Application)

• Make Compiler Pane standalone
• Rewrite bottomless pit logic:
  • Allow 1+ deep pits.
  • In BTS (specifically) add pits directly to the map.
• Fix P1 physics sounds not being loaded.
• Make selector windows non-modal.

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• New Item: Monitor and Camera (P1, Clean, Overgrown)
  • These allow showing another part of the test chamber on screens, or show GLaDOS/Wheatley.
• New Item: Conveyor
• Add P1 Angled Panels.
• Add Overgrown Fizzler, Pedestal Button variants.
• Add StyleVar to make exit corridors not restart the map
• Fix Original Clean ceiling (BEEmod/BEE2-items#600).
• Add 'Start Reversed' to partial blocks (inverts the colour).
• Fix respawning Futbols (BEEmod/BEE2-items#603)
• Add beams to horizontal P1 glass.
• Fix P1 door lights.