NavigationBar : Customization

Allows user to customize navigation bar.

Features :
- Choose from 1-6 # of buttons
- Re-arrange / assign buttons

Patchset 1  : Initial commit
Patchset 2  : Resize side drawables to avoid requestRelayout() [HACK]
Patchset 3  : Added extras to intent to explicity change state
Patchset 4  : New drawables (David Tonder)
              Fix button animation
Patchset 5  : Switch button layout to stock dimensions
              Adjust padding according to new layout
Patchset 6  : Change "Blank" to "Empty" where applicable
Patchset 7  : Lowercase key names (Will require a wipe of the database entry)
              Fix issue where during edit mode if screen turns off, layout gets distorted on restore
              Add "save" extra to intent to clarify whether to save the layout or not
Patchset 8  : Rebase for 4.0.4
Patchset 9  : Fix padding / lowLights
Patchset 10 : Minor fixes
Patchset 11 : Fix issue with losing edit mode after theme changes
	    : Fix whitespace issue
            : Fix low light gravity in landscape
            : Add regular menu button option (icons by DvTonder)
	    : Localize resources
            : Fix padding issue
Patchset 12 : Hide searchbutton like others on lockscreen
Patchset 13 : Fix lowLight padding
Patchset 14 : Code cleanup
Patchset 15 : Minor edit

Change-Id: If24a4413f99b8b4661ffd7ad9565c005fa22d7ba