StatusBarView: Ensure to not overload in/out animations

- Post animate call in main thread, thanks @David96
- Handle animation checking current view visibility

Change-Id: Ic8a422d1089c5d147e31b5a1f33e11a82a023253
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Signed-off-by: David L.-W. <xD_e-mail@gmx.de>