Variants-CIT

The current 26.1 branch seems to be compatible with the upcoming MC 26.2. I've marked it as such, but thread carefully.

• Fixed a compat issue with Iris Shaders, causing sanitize_auto and the custom_name module to yield different results from usual.
• Fixed hyphens '-' being incorrectly removed by most flavours of sanitizations.
• Fixed crash when using expect and nbtPath together.
• Fixed custom trident displaying incorrectly on shelves. (MC 1.21.9+)
• Added assetGen presets: item_model/spear, item_model/player_head, item_model/handheld_rod

• Fixed a compat issue with Iris Shaders, causing sanitize_auto to yield different results from usual.
• Fixed hyphens '-' being incorrectly removed from identifiers by most flavours of sanitizations.
• Added sanitize_legacy as an alias of sanitize for parity with v5.

• Modules are now banned from having an empty model prefix.
  This shall be the last breaking change of v5.
• The output of the dump command is now sorted by variant-ID.
• Fixed the get_number transform converting NBT to Optionals.
• Fixed unspecific error message when running a command on a non-existent module.

• Added item property: display_name, which is kind of a combination of the item_name and custom_name components.
• Added transforms: get_nbt, get_snbt.
• Transform get_identifier now takes an optional parameter: defaultNamespace.
• Module component_format now takes an optional transform parameter, which is applied to the format string after variables substitution.