Game controls improvement & gamepad support

[tomchen]

• [x] Docs https://github.com/arcomage/arcomage-hd/blob/main/gamecontrols.md
• [x] Mouse improvement & fixes
• [x] Touch Device improvement & fixes
• [x] Keyboard improvement & fixes
• Gamepad support
  • [x] Main
  • [ ] Lazy load gamepad code
  • [ ] Virtual keyboard ⌨️
  • [ ] Hand cursor mode 👆 (stick controlled)