Launch floating notifications from notification panel

Conflicts:
	packages/SystemUI/res/values/euc_strings.xml
Kill floating activities running in the same...

...thread when tapping outside

This change makes all activities from the same app to be finished when
we tap outside the halo window. Other apps running in different threads
(floating or not) won't be finished.

Port from here: ParanoidAndroid/android_frameworks_base@f489f45
Fix build error