Only activate views when they are hit test visible.

This prevents RoutedViewHost and similar controls derived from
TransitioningContentControl from activating when a view gets loaded in the
"previous" ContentPresenter for the purposes of displaying transitions.
Merge pull request #526 from jen20/fix-wpf-double-activation

Only activate views when they are hit test visible.
Move ReactiveActivity and Fragment to new less-boilerplatey extension
Add ability to set table section footer text, and fix build
Add an async method for invoking an Intent
Fix up AndroidPlayground
Remove ViewPager for now, until we can shove it into its own library
Dumb fixes for dumb mistakes
Merge branch 'rxui6-master' into async-intent-result
Merge pull request #528 from reactiveui/async-intent-result

Async intent result
Merge pull request #527 from reactiveui/add_footer_text

Add ability to set table section footer text, and fix build
Removed ref to Bcl.Async
More :fire:
Throw exception on add range is null + test
Throw on insert range + tests
RemoveAll exception+ tests
Merge pull request #529 from ammeep/ammeep/remove-old-bcl-async

Remove old bcl async project refs
:fire: i should have caught you.
Merge pull request #530 from ammeep/ammeep/reactive-list-exception-time

Reactive list exception time
Version bump to 5.99.4-beta