StatusBarView: Ensure to not overload in/out animations

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

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Signed-off-by: David L.-W. <xD_e-mail@gmx.de>
Change-Id: I3871ce65ef15c731ce0e7fcce5d07e5b5f40fc54