Dialer Landscape Mode

Bring back functionality to the landscape dialer.

Patchset 2 : Fix spacing.

Patchset 3 : Add dialpad settings. (depends on http://review.cyanogenmod.com/#change,10531)

Patchset 4 : Remove uneeded shared preference object.
             Fix preference icon.

Change-Id: Iff644890ac751dc99090a59bb824d319221e86ae