Add miscelaneous audio features

This commit adds:
 - Ascending ringtone (maniac103)
 - Silent mode
 - Volume panel style (ptunstall)
 - Link volumes

Change-Id: I21742ab94e45407111794b5868d9b4f14d7488da

Conflicts:

	res/values/arrays.xml
	res/values/strings.xml

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml

Conflicts:

	res/values/strings.xml