v0.8.0

This major release improves the way Borg jobs are handled. It also adds support for Python 3.10 and removes our dependency on APScheduler. This is a pre-release and some bugs in this branch aren't addressed yet.

Changes in detail:

• Implement multiple queues. By @bastiencyr (#1045)
• Show backup size with excludes applied. By @freder (#961)
• Remove APScheduler dependency, Python 3.10 support (#1086)
• Add tooltip containing path name. By @XXXBold (#1072)
• Increases the maximum allowed number in prune keep. By @lstrz (#1089)
• Always handle autosave setting when saving SettingsModel. By @phihos (#1093)