feat: add new config general.shutdown_commands and general.reload_commands and shutdown/reload Zebar along side the WM

[JonasWischeropp]

This PR addresses #650 and #646
I added two config entries that allow easy execution of commands at shutdown and restart similar to general.startup_commands.

Config entry	Execution time
general.shutdown_commands	just before shutdown
general.reload_commands	after config has reloaded

These are then used in the sample config to shutdown and reload Zebar.

general:
  startup_commands: ['shell-exec %userprofile%/.glzr/zebar/start.bat']
  shutdown_commands: ['shell-exec taskkill /IM zebar.exe /F']
  reload_commands: [
    'shell-exec taskkill /IM zebar.exe /F',
    'shell-exec %userprofile%/.glzr/zebar/start.bat'
  ]

[vlad420]

Good One! This is necessary.

[lars-berger]

Really well written, thanks for taking care of this 🙌

Just a couple nitpicks, otherwise good to go

[JonasWischeropp]

I have refactored the code.

[lars-berger]

Sweet looks great 👌

[lars-berger]

Hey @JonasWischeropp quick heads up - did some minor fixups in a follow-up pr at #742

didn't manage to get the Zebar config reload command to work (could be a change in Zebar v1 -> v2 that changed the behavior), so i'll remove that for now until a CLI command is added to Zebar for reloading

[lars-berger]

BTW will get around to reviewing your new PR shortly 👌 Sorry about the wait

[github-actions]

🎉 This PR is included in version 3.2.0 🎉

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