Refactor homescreen AppManager

The Good News :angel:

No additional hacking of CSS and JS of existing ConfirmDialog
AppManager has its own JS, CSS and view now
More polished UI (Not necessarily FFOS style, but please give feedback)
The Bad News :imp:

Breaks the display of the selected app's icon
Breaks deletion of apps (needs a confirmation screen, but otherwise easy to fix?)
Breaks navigation to the mockup of bluetooth share view (should be redesigned anyway)
Got a bit carried away with the styling and refactoring but let me know what ya think!

See video: https://www.dropbox.com/s/f70afq6fb1835f3/ffos.m4v