map new CSS properties:
- `color` on `IColorElement` (`ActivityIndicator`, `BoxView`),
`ProgressBar` and `Switch`
- `row-gap` and `column-gap` on `Grid`
- `transform` and `transform-origin` on `VisualElement`
- `vertical-align` on `Label`
add new XF-specific CSS properties
- `-xf-placeholder` and `-xf-placeholder-color` on `Editor`, `Entry`,
`SearchBar`
- `-xf-max-length` on `InputView` (`Editor` and `Entry`)
- `-xf-bar-background-color` and `-xf-bar-text-color` on
`NavigationPage` and `TabbedPage`
- `-xf-orientation` on `ScrollView` and `StackLayout`
- `-xf-horizontal-scroll-bar-visibility` and
`-xf-vertical-scroll-bar-visibility` on `ScrollView`
- `-xf-min-track-color`, `-xf-max-track-color` and `("-xf-thumb-color`
on `Slider`
- `-xf-spacing` on `StackLayout`
This PR replaces and closes#3276
- fixes#2891
* [All] Normalize Obsolete attributes.
Make sure we include the version in which the member was deprecated and
consistent instructions for working around the deprecation, if
applicable.
* Update docs
* Playing around with how the platform specifics interfaces etc. might work
* Sample implementation of iOS navigation translucency
* Very slightly reduced code
* Better vendor stuff
* Drop single-implemenation interfaces
* Generics on NavigationPage
* On-demand vendor stuff
* Remove functionally duplicate classes and make ControlGallery work again
* Namespace all the things. XAML test.
* Can use Effect to attach platform specific
* Attach Effect on PropertyChanging for XAML support!
* Rename IConfigPlatform interfaces for readability
* Some renaming to match the documents
* Split class files
* Clear out test-only code
* Re-namespace
* Added On method to rendered Elements
* Allow for removal of platform suffix, convenience methods on specific platforms
* Creating a gallery page for specifics
* Add rudimentary Platform Specifics gallery; make CollapseStyle work on UWP;
Add CollapsedPaneWidth specific property
* Toolbar now working with both collapse styles
* MDP now displaying Content title; toolbar routing around title
* Add a gallery for the iOS NavigationPage stuff
* Add Navigation Page as detail page to verify it works with new Toolbar options
* Make titlebar/toolbar background colors consistent
* ToolbarPlacement now working on NavigationPage
* Toolbar Placement working for tabbed and nav pages
* Fix bug where phone doesn't get default toolbar placement on start
* [Core] Add PS WindowSoftInputModeAdjust
[Core] Make Application extendable
* Toolbar placement now working on Nav, Tabbed, and Master pages on desktop/phone
Remove unnecessary style indirection
Fix build errors
* [A] Add PlatformConfigurationExtensions
* SetSoftInputMode test page
* [A] SetSoftInputMode
Known issue: Status bar color does not work in AdjustResize mode
* [Core] Add PS Blur
* [iOS] Configure renderer for blur
* Add test page
* Move to blur VisualElement for broader support
* Move test pages to gallery
* Update docs
* Use lazy initializer for PlatformConfigurationRegistry