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

Change-Id: Ibb87466cc7cf7ce127a712b161a9476ef35dbe6e

Conflicts:
	res/values/psd_strings.xml
	res/xml/sound_settings.xml
	src/com/android/settings/SoundSettings.java
OmniGears: enhance AppSelectListPreference

Added support for a third button

Change-Id: Ic152913610ec374144cd7a6388fa8f21ed5d0aeb

Conflicts:
	res/values/psd_attrs.xml