Transitions for show hide
Position parameters improvement.
Transition effects separation:

Show/Hide transition effect is now for Visiblity,
ParentShow/ParentHide is now when one of parents (no matter in which generation) is shown or hidden. Supported parents using this attribute are: UiPage, UiModalLayout.

Simpler code for UiPage and UiNavigator.
Transition effects separation:

Show/Hide transition effect is now for Visiblity,
ParentShow/ParentHide is now when one of parents (no matter in which generation) is shown or hidden. Supported parents using this attribute are: UiPage, UiModalLayout.

Simpler code for UiPage and UiNavigator.
Merge branch 'master' of https://github.com/ebatiano/Sitana

Conflicts:
	Sitana.Framework/Ui/Views/Containers/UiPage.cs
Editor - tools
Android version
Merge pull request #27 from ebatiano/master

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