Mass update to Forms 5.0. (#682)
* Remove sample.
* Removed samples.
* Mass update to 5.0-pre1
* Removed MediaElement and Expander.
* Removed experimental flags.
* Use xct:Expander
* Rename MasterDetailPage to FlyoutPage.
* Replace MasterDetailPage with FlyoutPage
* Formatting applied.
* TargetFrameworkVersion updated to 10.0.
* RoundRectangleGeometry example added.
* Blur applied on the specified VisualElement.
* Use the 5.0 RadioButton API.
* Minor updates.
* Threshold example added.
* Navigating overrides commented out.
* RadioButton demos updated.
* minSDKVersion bumped to 21
* targetSdkVersion set to 29.
* Removed tabbar and toolbar references.
* Removed TabLayoutResource line.
* Remove ToolbarResource line.
* Removed Tabbar.axml AndroidResource from csproj.
* Remve Toolbar.axml AndroidResource from csproj
* Removed Tabbar.xml
* Removed Tabbar.axml
* Remove Toolbar.xml
* Remove Toolbar.axml
* Remove references to Tabbar.xml
* Remove references to Toolbar.xml
* Updated designer files.
* AndroidX support.
* Forms 5.0 updates.
* AndroidX updates.
* AndroidX updates.
* AndroidX support.
* AndroidX updates.
* AndroidX updates.
* Update plugin.
* Update to 5.0-pre2
* Sample fixed.
* Set target platform version and min version to 10.0.17763.0
* Tidy up using statements.
* MinVersion reset to 10.0.16299.0
* Remove StrokeThickness=1
* RadioButton experimental flag removed.
* Expander sample using XCT.
* Mass update to 5.0.0.1558-pre3
* Added FlyoutFooter.
* Samples now use XCT.
* Update to Forms 5.0-pre4
* Update to 5.0-pre4
* Updates.
* WebViewExecutionMode platform-specific on UWP.
* Mass update to 5.0.0.1874.
* UWP fixes.
* Android fixes.
* Sample removed.
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