Pre-Release 11

If updating from an earlier version, delete 'brushes.zip' from the packages folder - this was renamed to 'decorations.zip'!

• Add dummy Barrier Type property to fix custom fizzler crashes
• Diversity vents no longer have the diamond-shaped platform
• Use ported P1 pellet catcher sound and sprite
• Add new laser window item
• Add 50s variations of several items:
  • Pellet Catcher (based on a version by IVO)
  • Pellet Emitter
  • Laser Catcher
  • Laser Emitter
  • Turret
  • Funnel
  • Glass Frames
  • Angled Panels
  • Diversity Vent
• Use more ported textures to improve P1 style appearance
• Fix P1 pedestal button
• Add P1 Funnel
• Use 1980s lifts (different shaft texture, no fizzler)
• Fix BTS paint droppers
• Add quarter wall item
• Clean track platforms match surrounding tiles
• Fix location of observation grating portals
• New 1970s Coop corridor (#2)