[1/2] Left handed navbar during landscape mode

This patch allows for the navbar to be moved to the left side of the
screen during landscape mode. Left handed people are more used to this
option.

This patch must go with another patch that changes framework/base

Screenshot: http://i.imgur.com/jWqJcEV.png

Conflicts:
        res/values/cm_strings.xml
        res/xml/system_ui_settings.xml

Change-Id: I04b2be98b9ffce96b4c36c2e3eae398a9e99562f