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Android: rework backend to use android-activity crate (#2444)

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This updates the Android backend to use the android-activity crate instead
of ndk-glue. This solves a few issues:
1. The backend is agnostic of the application's choice of Activity base
   class
2. Winit is no longer responsible for handling any Java synchronization
   details, since these are encapsulated by the design of
   android_activity
3. The backend no longer depends on global / static getters for state
   such as the native_window() which puts it in a better position to
   support running multiple activities within a single Android process.
4. Redraw requests are flagged, not queued, in a way that avoids taking
   priority over user events (resolves #2299)

To make it possible for application crates to avoid explicitly
depending on the `android-activity` crate (and avoid version conflicts)
this re-exports the android-activity crate under:

  `winit::platform::android::activity::*`

This also adds `android-native-activity` and `android-game-activity`
features that set the corresponding android-activity features.

Addresses: PR https://github.com/rust-windowing/winit/pull/1892
Addresses: PR https://github.com/rust-windowing/winit/pull/2307
Addresses: PR https://github.com/rust-windowing/winit/pull/2343

Addresses: #2293
Resolves: #2299

Co-authored-by: Markus Siglreithmaier <m.siglreith@gmail.com>

Co-authored-by: Markus Siglreithmaier <m.siglreith@gmail.com>
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@ -188,41 +188,41 @@ Legend:
|Fullscreen |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |✔️ |
|Fullscreen toggle |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |✔️ |
|Exclusive fullscreen |✔️ |✔️ |✔️ |**N/A** |❌ |✔️ |**N/A**|
|HiDPI support |✔️ |✔️ |✔️ |✔️ |▢[#721]|✔️ |✔️ |
|HiDPI support |✔️ |✔️ |✔️ |✔️ |✔️ |✔️ |✔️ |
|Popup windows |❌ |❌ |❌ |❌ |❌ |❌ |**N/A**|
### System information
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |WASM |
|---------------- | ----- | ---- | ------- | ----------- | ----- | ------- | -------- |
|Monitor list |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |**N/A**|
|Video mode query |✔️ |✔️ |✔️ |✔️ |❌ |✔️ |**N/A**|
|Monitor list |✔️ |✔️ |✔️ |✔️ |✔️ |✔️ |**N/A**|
|Video mode query |✔️ |✔️ |✔️ |✔️ |✔️ |✔️ |**N/A**|
### Input handling
|Feature |Windows |MacOS |Linux x11|Linux Wayland|Android|iOS |WASM |
|----------------------- | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
|Mouse events |✔️ |▢[#63] |✔️ |✔️ |**N/A**|**N/A**|✔️ |
|Mouse set location |✔️ |✔️ |✔️ |✔️(when locked) |**N/A**|**N/A**|**N/A**|
|Cursor locking |❌ |✔️ |❌ |✔️ |**N/A**|**N/A**|✔️ |
|Cursor confining |✔️ |❌ |✔️ |✔️ |**N/A**|**N/A**|❌ |
|Cursor icon |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|✔️ |
|Cursor hittest |✔️ |✔️ |❌ |✔️ |**N/A**|**N/A**|❌ |
|Cursor locking |❌ |✔️ |❌ |✔️ |**N/A**|**N/A**|✔️ |
|Cursor confining |✔️ |❌ |✔️ |✔️ |**N/A**|**N/A**|❌ |
|Cursor icon |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|✔️ |
|Cursor hittest |✔️ |✔️ |❌ |✔️ |**N/A**|**N/A**|❌ |
|Touch events |✔️ |❌ |✔️ |✔️ |✔️ |✔️ |❌ |
|Touch pressure |✔️ |❌ |❌ |❌ |❌ |✔️ |❌ |
|Multitouch |✔️ |❌ |✔️ |✔️ |✔️ |✔️ |❌ |
|Keyboard events |✔️ |✔️ |✔️ |✔️ |❓ |❌ |✔️ |
|Keyboard events |✔️ |✔️ |✔️ |✔️ |✔️ |❌ |✔️ |
|Drag & Drop |▢[#720] |▢[#720] |▢[#720] |❌[#306] |**N/A**|**N/A**|❓ |
|Raw Device Events |▢[#750] |▢[#750] |▢[#750] |❌ |❌ |❌ |❓ |
|Gamepad/Joystick events |❌[#804] |❌ |❌ |❌ |❌ |❌ |❓ |
|Device movement events |❓ |❓ |❓ |❓ |❌ |❌ |❓ |
|Drag window with cursor |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|**N/A** |
|Drag window with cursor |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|**N/A** |
### Pending API Reworks
Changes in the API that have been agreed upon but aren't implemented across all platforms.
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |WASM |
|------------------------------ | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
|New API for HiDPI ([#315] [#319]) |✔️ |✔️ |✔️ |✔️ |▢[#721]|✔️ |❓ |
|Event Loop 2.0 ([#459]) |✔️ |✔️ |❌ |✔️ |❌ |✔️ |❓ |
|New API for HiDPI ([#315] [#319]) |✔️ |✔️ |✔️ |✔️ |✔️ |✔️ |❓ |
|Event Loop 2.0 ([#459]) |✔️ |✔️ |❌ |✔️ |✔️ |✔️ |❓ |
|Keyboard Input ([#812]) |❌ |❌ |❌ |❌ |❌ |❌ |❓ |
### Completed API Reworks