Pre-Release 13

• Add puzzle backup/restore utility (File > Backup/Restore, or run bin/backup_tool). This allows backing up and restoring puzzles. It can optionally be triggered automatically when exporting items.
• Added an internal templating system to allow generating complex geometry with style and orientation-appropriate textures.This is used for angled blocks and the cutouts surrounding Excursion Funnels and cube droppers. (The textures now vary just like walls do.)
• Rewrote the clumping randomization algorithm (used for Old Aperture and BTS walls) to allow it to function on ceilings as well, and to apply correctly to partial block items.
• Added the ability to disable individual packages, without deleting the actual zip file.
• Reduced the size of the application binaries.

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• Add Angled Blocks
• Add Flat Partial Blocks
• Add 'Special Marker' item
• Window item stripes always generate horizontally
• Fix BEE logic gates
• Improve P1 observation rooms (floor/ceiling versions, add light models)
• Use models for P1 style sign frames
• Add borders to top and bottom of 50s and BTS fizzlers.
• Generate Cave Portraits dynamically based on chosen voice pack (50s-80s, Clean style)
• Fix 60s flamethrower

Mac version 13.1: use correct version of FakeZip.