Revert "Better expose 'QS Tiles and layout' function"

Reorganizing & customizing the QS tiles is one of our features, but it
is buried 4 clicks deep in Settings menus. This is not ideal.

Create a new icon on the main QS panel view to quickly launch into
the configuration page.

Screenshots: http://imgur.com/a/H3iN7

This respects all the existing flip animations and quick pulldown. Does not
interfere with the clear-all button either.

PS2: Rebase
PS3: Change intent
PS4: Add missing boolean
PS5: Whitespace & Use different icon
PS6: Address comments and add additional drawable densities
PS7: Fix reference to old drawable
PS9: Swap back to + icon
PS10: Typo

Change-Id: Ia715767ba2a7cfdd44b0fafa082877def6867440 (reverted from commit 1bc87e720b68d97aabc214632f908495acfed932)
Whitelist apps for AppOps

Signed-off-by: Almite <almite@hotmail.com>