[2/2] Settings: Add ActiveDisplay

Active display: Add options for date and am/pm [2/2]
Change-Id: I6af47b2fd47e77398eee98cc6e30b8fcf1a44d45

Active display: Add sunlight mode. [2/2]
Change-Id: I513c2ef1555ca48dfb553f80ca687d1ca9f27c55

Active display: allow hiding low priority notifications. [2/2]
Change-Id: I244743ed1a32f59065af3c4507f4132b7d3b0d72

Active display: Allow apps to be excluded from being displayed [2/2]
Change-Id: Ieb6368c050f5b46eec7398ab0162dc4fbf00a392

Active Display: Add always show pocket mode. [2/2]
Change-Id: I6f791c5727e98749780a5e9996e20d387ed98fa6

Base: https://gerrit.omnirom.org/#/c/2679/
Settings: https://gerrit.omnirom.org/#/c/2586/

Change-Id: Ibeb35ea4321cf8ee1bdfbb1c6c1f7ab841679932