Pdfstitcher

More refactoring, this time with Nuitka building for Mac as well.

Mostly just moved files around, but hopefully there are no breaking changes.

What's Changed
* Extensive refactor for v1.0 release by cfcurtis in https://github.com/cfcurtis/pdfstitcher/pull/212

Highlights:
* Code signing and notarization on macOS
* Hopefully less Windows antivirus complaints
* Fixed some issues with UserUnit (large canvas)
* New translations from Weblate (thanks for your patience!)

**Full Changelog**: https://github.com/cfcurtis/pdfstitcher/compare/v0.9.2...v1.0b1

- "Fixing" macOS + encrypted PDF problem by rolling back pikepdf version to 7.2.0
- Fixing runtime error for large canvas files when UserUnit not found
- Fixing problem with making all lines thicker at once
- A few other small bug fixes

What's Changed
* Bug fixes by cfcurtis in https://github.com/cfcurtis/pdfstitcher/pull/201

**Full Changelog**: https://github.com/cfcurtis/pdfstitcher/compare/v0.9.1...v0.9.2

June 7 update: There was a broken version on here for a few days - I accidentally ran the release workflow from `main` instead of my `cleanup` branch. This should now be fixed. Thanks to langer29 (and Facebook users) for reporting!

What's Changed
* Support for "Large canvas" PDFs
* Adding support for different UserUnit by cfcurtis in https://github.com/cfcurtis/pdfstitcher/pull/190
* Default to "no tiling" if pages are larger than A3
* If any page in the document has a non-unity UserUnit, the final document will have the largest UserUnit (usually 10)
* Bug fixes by cfcurtis in https://github.com/cfcurtis/pdfstitcher/pull/191
* Fixed display of selected options on document load
* Workaround for broken link when mac users are prompted to update
* Some more refactoring of tile_pages.py
* New translations: Simplified Chinese in https://github.com/cfcurtis/pdfstitcher/pull/192
* Also updates to French

**Full Changelog**: https://github.com/cfcurtis/pdfstitcher/compare/v0.8.5...v0.9.1

What's Changed
* Bug fixes: Windows 7 (64-bit) compatibility is now back again after accidentally getting removed
* Updates to Spanish translation

**Full Changelog**: https://github.com/cfcurtis/pdfstitcher/compare/v0.8.4...v0.8.5

What's Changed
* Fix to Czech fallback for Slovak language
* Fix to language detection in English on Linux (had broken preferences dialog)

**Full Changelog**: https://github.com/cfcurtis/pdfstitcher/compare/v0.8.3...v0.8.4