Janek Bevendorff 80c1b9be6a Improve macOS platform integration. ...

- Allow switching between themes without restart (except classic)
- Rework icon loading and recolouring logic to react to theme changes
- Automatically react to light/dark theme change
- Remove explicit selection of monochrome tray icon variant (selected
  automatically now)
- Update theme background colours for Big Sur
- Update application icon to match Big Sur HIG

The tray icon doesn't respond perfectly to theme changes yet on Big Sur,
since we need different icons for dark and light theme and cannot simply
let the OS recolour the icon for us (we do that, too, but only as an
additional fallback). At the moment, there is no signal to listen to
that would allow this.

This patch adds a few generic methods to OSUtils for detecting and
communicating theme changes, which are only stubs for Windows and Linux at
the moment and need to be implemented in future commits.

Fixes #4933
Fixes #5349

2021-01-07 15:22:48 +01:00

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