Feature flags that clash are no fun. This reworks a few things so that
docs can properly build with all feature flags at once and note their
support.
Also adds a supported table to the README for ease of discovery.
- Changes internal target_os flags to be feature flags; macOS is now
appkit, and iOS/tvOS are now uikit. This enables platforms that are
not Apple-specific platforms that use frameworks to be compiled for.
- Updates the examples to handle closing/quitting better.
- Added support for Image
- Added a QuickLook feature, to enable thumbnail generation.
- Added support for NSButton.
- Fixed a bug where App activation under Big Sur would leave menus
without the ability to be used.
- Added the ability for Buttons and ToolbarItems to execute callbacks.
- Added support for Labels and TextFields.
- Added support for MenuItems to have callbacks as well.
- Preliminary ListView support; you have to cache your ListViewRow items
yourself for the time being, but it works.
- Animation support for ListView operations.
- Support for ScrollViews.
- Helpers for dispatching actions to the main thread (for UI work).
- Updated the Dispatcher trait to make thread handling simpler.
- Basic font support.
