Add invert colors accessibility support

flutter-tizen / engine

The Flutter engine

https://flutter.dev

BSD 3-Clause "New" or "Revised" License

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Closed swift-kim closed 2 years ago

swift-kim commented 2 years ago

Add support for the invertColors accessibility feature for TV devices.

Other minor changes:

Shorten system_settings_key_e(SYSTEM_SETTINGS_KEY_MENU_SYSTEM_ACCESSIBILITY_HIGHCONTRAST) for better readability and consistency.
Rename result to ret (it's common practice in this repo).