Log errors via Windows notification system

[eugenesvk]

Describe your changes. Use imperative present tense.

Add an extra way for the Windows logger to notify on errors: use the OS notification system to show whatever fits
Configurable, on by default
Other log levels do not use OS notification to avoid spamming

(this is based on #1031 to make it easier to add, so will rebase on whatever that one ends up being after review)

Checklist

• Add documentation to docs/config.adoc
  • Yes or N/A
• Add example and basic docs to cfg_samples/kanata.kbd
  • Yes or N/A
• Update error messages
  • Yes or N/A
• Added tests, or did manual testing
  • Yes