call setButtons with empty fab object to remove it

* Implement right SideMenu on Android

* Adapt toggleSideMenu and toggleSideMenuVisible to right SideMenu

* NavigationActivity implements PermissionAwareActivity

* NavigationActivity implements PermissionAwareActivity

* Fixed code styling

* Removed Hungarian notation.

* Removed empty line

fixes #493

closes #464

Notify the Activity layout that the top most Modal was dismissed only
if no other modals are displayed. Currently this event is used as a
`onVisible` event to to the layout. This whole logic can be simplified
when we implement proper screen visibility events.

When ivoking navigation actions such as push, pop etc, instead of
checking modal visibility, check if modal actually contains the given
navigator. This fix alows to change navigation state in screens while
modal is displayed.

This reverts commit d3582d2780.

This commit adds support for displaying an activity with no animation
by setting `animationType: none` when calling `startApp`. In the future
we can support more animation types if there's a demand for it.

works best with drawUnderTabBar