* Bindable Text Property on Span
* Style applied to Span
* Added style property
* Unit tests added
* Minor fix and cleanup
* Cleanup of code after review
* Updated docs
* Set Parent and reduce calls to Text property
* OneTime Binding
* Allow OneTime Binding as a default
* Updated docs
* [Xaml] Chain op_implicit for OnPlatform (if needed)
For OnPlatform<T>, if a conversion for T to the destination type exists,
first convert OnPlatform<T> to T, the T to the dest type
Also unify the way we look for op_implicit operators
* [Xaml] only apply the double opImplicit if a flag is set
* [C] allow conversion on parameter
* [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
* Remove InternalsVisibleTo from Core to XF.Platforms.*
* Changes per Jason's code review
* Move LockableObservableListWrapper to internals namespace
* Changes per Stephane's code review
* update docs
* Touch code to get CI to run tests
* Rebase; Update documentation