[View] hide/display actionBar on tap

Signed-off-by: Sebastien MICHEL <michoux@gmail.com>
[View] Add setting for default action bar behavior

Signed-off-by: Sebastien MICHEL <michoux@gmail.com>
[All] Action bar reorg

* Remove Gallery buttons: back button does the job
* Add capture on edit to quickly retake a shot (same as back in some
cases)
* Add setting button on all mode (TODO: Fix View mode refresh)

Signed-off-by: Sebastien MICHEL <michoux@gmail.com>