IMS: Only enable IMS calls if IMS service status shows enabled

Change-Id: I9bd4ce17a62dcf188989dd79dc9deaa78e491fa6
Telephony: Heads up meets SlimKat....SlimKat meets Google IO [3/4]
Add heads up setting for the native integration in dialer

Enabled by default

PS
- derp

PS
update commit message header

Change-Id: I0a540f2dc2667d572797a68c07b6eb471653ec16
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0