Changes:
- New merger for `ResidentActors.byml`
- New "View on GB" button for GameBanana mods
- New option to mark BNP as having needing lowest priority
- Better errors for GB problems
- Official Python 3.8 support on Windows
- Optional SARC cleaning for graphic pack installs
- No more special Windows installer
- UI and UX tweaks
- Remove advanced options for map merger
- Odds and ends