WIP: Improve Recents menu (1/2)

-Choose position of recents clear all button (BR, BL, TR, TL)
-Show Carbon background when no recents apps are present

Huge credit to andros11 as this is larely based off his work and
to RootBox for the background idea and Omar Asad for the image!
Revert "WIP: Improve Recents menu (1/2)"

This reverts commit 2f976d70c1a7da3ffbd92c3386fa202c8c2a3363.
Merge remote-tracking branch 'upstream/recents' into jb3