Add Windows split tunneling

[ramimbo]

Closes #114

Summary

• add Windows settings for enabling split tunneling and selecting bypass apps
• capture the physical default route before tunnel startup, then add per-destination host routes for selected app processes
• apply the routing worker for both WireGuard and V2Ray connections and remove saved routes on disconnect

Tests

• PYTHONPATH=src python3 -m pytest -q
• python3 -m compileall -q src/cli src/conf src/helpers src/ui src/adapters src/typedef
• git diff --check HEAD~1 HEAD

[freQniK]

will review within the next week

[freQniK]

a dev reviewed this for me and said initially there was issues. He mentioned he would create a PR with the fixes. I'll consider both for the bounty. Note: the bounty of 1 XMR is for both MacOS and WIndows. If, this proves to work on WIndows the bounty would be .5 XMR split lopsided in your favor so long as the fixes weren't substantial.