Messaging: Add the ability to mark a message as read from the notification

Note: It will only shows on single threads, just like the Call action

Also tweaks the settings strings a bit

Change-Id: I4b4ca1eb7c4d211b0d5765f0093263f351776a9a

Conflicts:
	AndroidManifest.xml
	res/values/strings.xml
	src/com/android/mms/quickmessage/QmMarkRead.java
	src/com/android/mms/transaction/MessagingNotification.java
Messaging:  Only allow Mark as read when Quick reply is active

Change-Id: I1d3e803f28d8f7bd52059deb5a48f861ddf01545

Conflicts:
	src/com/android/mms/transaction/MessagingNotification.java