Slim Recents: Option to show topmost task [1/2]

Change-Id: Ib39d9b87b0fd30b4d34d4292af39e891038f337a
Slim Recents: Always show topmost task collapsed

PS2: Also restore expanded state of topmost task when on homescreen
PS3: Fix code style

Change-Id: I64956410fb389d8e880979a84b51321d8b372217
SlimRecents: Rework show top most task feature

recently introduced this feature needed a bit rework. Basic changes

- do not call settings provider on every preload to prevent high IO work.
  Use our observer for that
- Use internal flag logic to mark topmost task
- Move interpretation of the expanded state into the card
- Due that topmost task is always collapsed do not show expanded icon at all
- Minor cleanup

PS:
- set mFirstTask to null if it is not used

Change-Id: Ifaabc035b6b9bd2d4527d5b34a1bca9c80a74e32
SystemUI: Add missing hdpi resources for left gravity recent panel

Change-Id: Ic2915cb7be01be9e66620e4d7edc530e0d75b404
FB: Slimrecents background color && transparency [2/2]

PS: now setting sticks through reboots and TRDS state
        changes. also, add reset to default color option.

PS: when resetting to default, use TRDS (png) resources
        instead of custom color

PS: remove LSN dependency

PS: make default background setting cognizant of
        recent panel gravity setting to display
        correct background resource
Change-Id: Icf0259ce45d416364d6e7a7a8c2038f6c4c0cbde