Refactor and Integration of DeviceInputSystem into BabylonNative (Part 2)

[PolygonalSun]

Required

• [ ] Add support for other devices/functionality
  • [ ] Evaluate and Implement Mouse detection for Unix and MacOS
  • [x] Mouse secondary buttons
  • [ ] Keyboard
  • [ ] Gamepads
  • [ ] Modify isDeviceAvailable to reflect availability of devices
• [ ] Convert Touch to work as single device
  • [ ] JS Side
  • [ ] Native side (as applicable)
• [ ] Evaluate next candidates for DOM conversion (and convert, if possible)
  • [ ] UI Elements
  • [ ] Tools

Secondary/Stretch Goals

• [ ] Make DeviceInputSystem more modular
  • [ ] Create custom device type
  • [ ] Break JS code into parts to minimize size of WebDeviceInputSystem
• [ ] Add multi-fetch polling functionality
• [ ] Create event recorder for testing (JS side)