Add Samsung MultiWindow support

From WakiWaki on 2016/08/22 18:29:16 +0000

Even though AOSP multi window is coming in android 7.0 millions of devices won’t ever get that version. I would like to suggest support for Samsung multi window support. It would be very helpful in situations where you look at other apps when creating an alarm.
More info:

Copied from original feature request: