Mobile (Android/iOS) support

[nicoburns]

The counter, and todomvc, and browser crates are configured for compiling to mobile.

A version of the CLI from DioxusLabs/dioxus#5147 should be used.

To compile for Android: dx serve --android -p counter --no-default-features --features cpu
To compile for iOS: dx serve --ios -p counter --no-default-features --features cpu

Tasks

• Upgrade to Winit 0.31
• Compile Dioxus Native for mobile with Dioxus CLI
  • Compile for iOS with the Dioxus CLI
  • Compile for Android with the Dioxus CLI
  • Switch to GameActivity (Android)
• Touch events
  • Basic support
  • Drag to scroll
  • Momentum scrolling
  • Sort out issues with "hover"
  • Send touch events to Dioxus Native
  • Send pointer events to Dioxus Native
• Soft keyboard
  • Soft keyboard (iOS)
  • Soft keyboard (Android)
    • JNI based show_soft_input rust-mobile/android-activity#178
    • Add basic IME support for Android rust-windowing/winit#4451
• Safe area
  • Safe area (iOS)
  • Safe area (Android)
• Android back button support (expose as a hook?)
• Renderers
  • Skia on iOS (conditional compiles in anyrender_skia)
  • Skia on Android (OpenSSL)
  • Vello on Android (wgpu_context setup code?)