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

Change-Id: I210b747838b70fb64e6f0835b1cb42b31c9a199d

Conflicts:
	packages/Keyguard/src/com/android/keyguard/NotificationHostView.java
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: I6821a253e8620d1579e6e1dfa0e0d4571ae1af3d
Lockscreen Notifications: fix FC when an expanded notification gets reposted without bigContentView
Lockscreen Notifications: add back dynamic width as an option (1/2)

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/res/values/config.xml
	packages/Keyguard/src/com/android/keyguard/NotificationHostView.java
	packages/Keyguard/src/com/android/keyguard/NotificationViewManager.java