Build 25260930

the 9/11 update. modding fixes mostly!

Fixes
- fixed panic button not being discharged on save and load as intended
- improved twelve gauge clay shader visuals by getting rid of a completely nonsensical color space conversion
- fixed praxice being able to roll replacement character
- fixed jubilist nobody setting doomed columns on the incorrect attack
- fixed "death of the" looping during the credits rather than playing once and stopping
- fixed tiles being moved around having a lower z index than tiles in the word builder
- fixed difficulty / character selector arrow shadow moving with the arrow

Modding
- mods can now specify multiple override folders in mod.json with different priorities and load phases. if unspecified, the "overrides" folder will still work as it did originally
- mods will now load "mod.pck" and "cache.pck" by default if they are found in the mod files and no other packs are specified
- the mod packer is now a runnable scene with exported variables rather than an editor script, to allow for more convenient extending
- the mod packer now supports creating a separate "cache.pck" file containing godot class / uid cache info that needs to be loaded as an override
- the mod packer now supports automatically packaging the mod json and the created pcks into a zip file, for convenient distribution
- mod packer will now include any files found in a ".build_include" folder in the mod root directory in distribution zips
- mod packer can now ignore directories when packing pcks and ignores ".build_include" by default
- priority for packs and overrides is now a float rather than an int. this seems kinda scary...
- get_filtered_spell_pool() now takes a "filter" argument to determine whether category filtering should apply, to fix empty categories including all spells rather than none
- fixed get_unit_name() not passing whether the character is trans or not to the string context
- fixed a bug with zip packing resulting in super scary zip files. you had to be there.
- fixed mod run save data never getting loaded (due to a kind of absurd typo)
- fixed character select info strings (NAME/SEX/HGT/etc) being hardcoded instead of using localization files
- non-placeholder missing texture assets (???)