Lockscreen Notifications: make dynamic width a device overlay setting

dynamic width is disabled by default, to enable it for a specific device, add
<bool name="config_lnDynamicWidth">true</bool>
to yourdevicetree/overlay/frameworks/base/packages/Keyguard/res/values/config.xml
Lockscreen Notifications: rewrite add notification logic

There were some problems with notifications getting replaced while the user was currently dragging them.
This commit should fix that by always waiting until animations and user input are finished before replacing a notification view.

Change-Id: I53d5da164e9189a2ea12c02e7d24fd603985a2d1
Lockscreen Notifications: improve animations, cleanup

Change-Id: I408b69a39d9551d00ebc8aa54fb4ef7377fe818b