Doze: Refactor v1

Pulls appart UI, state, power, display and trigger management
into individual components controlled by a state machine.

Also adds tests.

Test: runtest -x packages/SystemUI/tests/src/com/android/systemui/doze/DozeMachineTest.java
Change-Id: I6ee7e79d58a5a3ebeb975775af44ad1e5aaccf93