Mms: Avoid showing a window when marking as read

Change the "mark as read" action implementation, so that it
uses a BroadcastReceiver instead of an Activity.

The downside of using an Activity is that the current top
activity will be paused and resumed. This pausing, however
brief, may disturb what the user is doing, like watching a
kitty video on youtube.

Change-Id: I1fe3868a1e82856e42265b14590fab721492db59
Mms: Add privacy mode notifications

This add privacy mode feature to notifications, user and message are hidden in
status bar and notifications area when privacy mode is enabled

Patch set 1-4 : Initial commits
Patch ser 5   : Slight wording change of summary string

Change-Id: I20f5fd198d51d7079345708725a58ef2c2a71b7f

Conflicts:

	src/com/android/mms/transaction/MessagingNotification.java
	src/com/android/mms/ui/MessagingPreferenceActivity.java

Conflicts:

	res/values/strings.xml