Merge Dev to Master

[Avasam]

New features:

• Use Qt's "fusion" theme
  • Windows darkmode support (Closes Darkmode on Windows #209)
  • Respect the system's theme. Both palette and accent colors.
  • More consistent style between Windows 10, 11 and Linux
  • Changes live without having to reboot autosplit
  • Removal of Windows 11 UI hacks

Internal / infrastructure:

• Drop PyQt6 in favor of PySide6
  • Will lead to better upstream support from the Qt team and stability improvements
  • Removal of ShortcutContext hacks
  • Removal of QListView height hack
• Add Magic Numbers to Coding Standards doc

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Already in Master

Bugfixes:

• Catch pygrabber failure when adding video input device (Fixes crash when trying to open Video Capture #238)
• Add image dimension check to region auto align feature. By @Gikkman (Fixes Error when trying to use "Align Region" feature #231)

Internal / infrastructure:

• Add another option to download dev builds for non-GitHub users
• Use Ruff to replace a lot of linting and formatting

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External

obs-virtualcam plugin has been updated to 3.1.0 and now supports OBS 29.1+