Draft: Implement powerbar app switching
This is a continuation of work done by @venji10 in his/her mr !1078 (closed) .
Changes done by @venji10
- Allow users to switch the active app by swiping left or right on the home bar
- Dragging the overview up resulted in switching the active application in some cases. That's undesired behaviour
Additional changes
- Use update_drag_handle function to reset swipe gesture when unfolding
- Set a minimum velocity to prevent unintentional swipes
- Rename on_home_swiped to on_powerbar_swiped
Edited by mathew-dennis