feat: Add a macro that allows users to convert paths into field values

[mm12]

closes #1203

Summary

This adds a macro that allows users to convert information in file paths into fields for those files.

New menu item:

Upon selection, the user is presented with the following window:

Which can be used to populate fields:

Tasks Completed

• Platforms Tested:
  • Windows x86
  • Windows ARM
  • macOS x86
  • macOS ARM
  • Linux x86
  • Linux ARM
• Tested For:
  • Basic functionality
  • PyInstaller executable

TODOs

• Look into ** TODO items suggested by code review
• QOL: Do something about the logging of data on each update
  • Perhaps tell the user which item it is on in the preview, some update indicator
  • Hopefully this also prevents the program from going into a "not responding" status, otherwise explicit reports to watchdog may be needed.
• Bug: Multiline fields should display multiline text boxes and properly handle newlines.
• Bug: Allowing multiple of the same field type should work
• Feat: Ability to save presets of pattern?
  • It would probably be better to put this off for the future.
  • Perhaps providing presets for common naming schemes (such as camera timestamps) would be good.
• Feat: Format regex for readability? (particularly for escaped / and . characters, possible disallowed characters. In addition, highlighting groupings might be helpful). might be better to make this part of bigger text input fixup to avoid feature creep.
• Feat: Something for tags? unlikely (feature creep), but would be nice to have. Like if we allowed items parsed here to be added to tags.
• Make sure we don't reapply fields to items. Will need to figure out a good way to do this without fully disallowing changes on items that have fields already
• Add documentation to site