[2/2] Settings: opens music app when headset is plugged - WIP

Change-Id: Ibb87466cc7cf7ce127a712b161a9476ef35dbe6e

Conflicts:
	res/values/custom_strings.xml
	src/com/android/settings/SoundSettings.java
settings: Make mobile settings a first-class citizen

 * Nobody likes carriers, but let's not bury these settings behind
   10 layers of indirection. Many users (like me) who travel often
   will need to access these options frequently.
 * The top level switch disables mobile data.

Change-Id: I1bd4d1116a2c73832230d66c94df2c3c0aacf698

Conflicts:
	src/com/android/settings/Settings.java