Phone: transparent in call widget (optional)

To see the complete contact picture on incomming calls
a lot prefer to have a transparent background. This commit
introduces this feature as optional option.

As well a bit sorting of the phone settings screen

cheers

Change-Id: I0ed0ec3b3ec819b66edd412f8f24b04b51cde37f

Conflicts:
	res/values/strings.xml
	res/xml/call_feature_setting.xml
Fix call target drawable misalignment for sw600-[m|h|xh]dpi.

For those resolutions, the framework ic_lockscreen_handle_pressed
drawable has a different resolutions. Use the same approach to fix it as
DeskClock: Just copy in the framework drawable for the supported
resolutions.

Change-Id: Ib00b1fb60e3966652ede3d3517c425fa2faf88de