DSPManager: Add xhdpi launcher icon, cleanup others a bit.

Change-Id: I179cc40913c830d4d26f383ed1df2c4d4b0fa9a2
Make DSPManager persistent service

This application must be running at all times, so that it can respond to
AudioEffect intents and manage audio sessions. Some users complained about
DSPManager not always managing their audio sessions, and I saw that
Android sometimes kills the DSPManager process and then ends up restarting
it mere seconds later. This is a likely cause for the problems, because
DSPManager will forget the IDs of the audio sessions in a restart.

This bugfix should be backported to every maintained CM release.

Change-Id: I79c6bb89453a171d45191163238c94abdc2226fe
Merge "DSPManager: Add xhdpi launcher icon, cleanup others a bit." into cm-10.2
Merge "Make DSPManager persistent service" into cm-10.2
Merge branch 'cm' into HEAD

Conflicts:
	res/drawable-hdpi/icon.png
	res/drawable-ldpi/icon.png
	res/drawable-mdpi/icon.png

Change-Id: I2dbc1a1a5e0b760f9087d65ee622498e747fb4d9
Signed-off-by: DHOMD <DHO@dho.im>