Meld: download ældre versioner

Features:
- Allow loading files with very long lines via prompt (#950) (Kai Willadsen)
- Attach Windows and macOS builds to releases from CI (Kai Willadsen)
Fixes:
- Raise the line length limit for loading files (Kai Willadsen)
- Improve dark mode detection (g.willems)
- Don't treat blank files as images when detecting image comparisons (g.willems)
- Move Windows build to UCRT64 (Kai Willadsen)
- Windows installer upgrade and uninstall fixes (Kai Willadsen)
Translations:
- Anders Jonsson (sv)
- Balázs Úr (hu)
- Baurzhan Muftakhidinov (kk)
- Ekaterine Papava (ka)
- Martin (sl)
- Rafael Fontenelle (pt_BR)
- Yuri Chornoivan (uk)

Features:
- Add support for building Meld as a Python wheel (Noam Raphael)
- Add screenshot-and-exit behaviour for CI testing (Noam Raphael)
Fixes:
- Avoid leaking file descriptors during matcher shutdown (#962) (Thomas Klausner)
- Fix opening version control conflict with a single file argument (#486) (Kai Willadsen)
- Fix crash when right-clicking on notebook (#949) (Kai Willadsen)
- Don't discard all sides when one side changed on disk (#823) (ks132)
- Fix diff updating in auto-merge comparisons (#957) (pknowles)
- Allow intl-8 in addition to libintl-8 on windows, to support conda (Noam Raphael)
- Fix opening comparison from folder compare with missing left file (#944) (Kai Willadsen)
- Metadata fixes (Sabri Ünal)
Translations:
- Alan Mortensen (da)
- Baurzhan Muftakhidinov (kk)
- Cheng-Chia Tseng (zh_TW)
- Guillaume Bernard (fr)
- Ibai Oihanguren Sala (eu)
- Kai Willadsen (nb)
- Марко Костић (sr)

Fixes:
- Fix incorrect DLL paths in Windows build (Kai Willadsen)
- Remove upstream deprecated 32-bit Windows build (Kai Willadsen)
- Issues fixed: #824
Translations:
- Daniel Rusek (cs)