Xsession-manager

What's Changed
* Fixes 32: Use "augmented assignment statements" (+=/-=) instead of assignment statements in https://github.com/nlpsuge/xsession-manager/pull/33

Thanks to elfring.

**Full Changelog**: https://github.com/nlpsuge/xsession-manager/compare/1.0.7...1.0.8

Added
1. Add `-v / --verbose` and `-vv` so all debugging information will be omitted by default
2. Improve `xsm -l`:
- Add the serial number in the results
- Sort the results by file modification time in ascending order

Changed
1. Only ask once before restore apps
2. Skip running apps while restore and exit immediately if all apps have been running already
3. Fine-tune time when restore apps
4. Use `Wnck.AppLaunchContext` to get the pid right after an app launched
5. Move `DesktopAppInfo` cache to `__init__` function to speed up searching
6. Match the whole word while search `.desktop` by an app name

Fixed
1. Cannot restore flathub app spotify and snap app superproductivity via `xsm -r -i super` and `xsm -r -i spotify` respectively

Changed
- Code cleaning and refactoring
- Improve README.md
- Support Python 3.10

Removed
- Drop -v


https://github.com/nlpsuge/xsession-manager/compare/1.0.5...1.0.6

Added
- Support display version via -v/--version

Changed
- Keep version in a single place (inspired by [youtube-dl](https://github.com/ytdl-org/youtube-dl))
- Update README.md and TODO.md
- Minor improvements

Fixed
- Fix bugs

Commits
https://github.com/nlpsuge/xsession-manager/compare/1.0.4...1.0.5

1. Fix cannot move Anki in which case Anki has two processes(may have some side-effects, I am not so sure)
2. Check whether cmdline is empty or not
3. Check whether can get info from Snap daemon or not
4. Handle multiple desktop files when launching a Snap app
5. Restore is_sticky/is_above after moving windows

All changes:
https://github.com/nlpsuge/xsession-manager/compare/1.0.1...1.0.3