Add Modver to Settings.

Change-Id: I596064a80210517ff0dae30401f71b52adabd614

Rename modversion

Change-Id: I6557d5aa68a3ad00166cdd2b8951f425ad7800df

DeviceInfoSettings: Use ro.cm.display.version instead of ro.cm.version

Follows the same logic as ro.build.display.id/ro.build.id:
engineering, debug and unsigned builds will have no distinction,
user and signed builds will show a simplified version

Change-Id: I713ccb2445ea2e333e831129ef7733fd518282eb

settings: This is CyanogenMod!

Change-Id: If9f14d6579b18c4ae049d35e312dd2d98746aced

Change-Id: I6557d5aa68a3ad00166cdd2b8951f425ad7800df