Squashed several lockscreen notification commits (2/2)

- Fix notification not responding when removed and added in a short period of time
- Just unlock screen on notification click when there's an activity to start
- Fix notification hide animation
- Just wake screen on reposted notifications when it's not ongoing
- Just scroll down in "showAllNotifications"
- Make offset top user configurable & add privacy mode
- Fix possible NPE
- Make width dynamic (WRAP_CONTENT)
- Lower alpha
- Make animations a bit faster
- Fix notifications disappearing on orientation change
- Disable dynamic width for devices <= xhdpi
- Allow apps to be excluded from being displayed

Change-Id: I67a9f680c0871534df6d2b59d477778ec62163c8
Merge "Squashed several lockscreen notification commits (2/2)" into du44