Unity

What's new in this version:

- Fix the system tray menu not being correctly replaced in setupContextMenu on GNOME
- Ensure call notification stays on top of other windows
- Work around issues with window positioning on Linux DEs, hardcode tray window to screen center when new account added
- Clean up systray methods, make more QML-friendly
- Refactor tray window opening code for clarity and efficiency
- Only set _FORTIFY_SOURCE when a higher level of this flag has not been set
- Limit concurrent notifications
- Take ints by value rather than reference in UserModel methods
- Respect skipAutoUpdateCheck in nextcloud.cfg with Sparkle on macOS
- Use preprocessor directive rather than normal 'if' for UNNotification types
- QML-ify the UserModel, use properties rather than setter methods
- Fix ActivityItemContent QML paintedWidth errors
- Stop clearing notifications when new notifications are received
- Ensure debug archive contents are readable by any user
- Stop styling QML unified search items hierarchically, use global Style constants
- Update macOS Info.plist
- print sync direction in SyncFileStatusTracker::slotAboutToPropagate
- Remove Ubuntu Impish, add Kinetic
- Ensure that throttled notifications still appear in tray activity model
- Make apps menu scrollable when content taller than available vertical space, preventing borking of layout