Launcher3: add missing layout_width and height

fixes launcher3 fc on note 10.1

Change-Id: Ia035d753b30a8294792efba2bc01eb2323431a85
Launcher : Make settings launch/dismiss overview mode

Aosp has the settings icon no-op'd since in the google edition,
it maps to google now search settings. This makes it so it maps to
the settings application.

Change-Id: I5a70705f2e7fde75511868fb351436f072dfabfb
Allow some customization in Launcher3

This patch allows a user to customize:
- Grid with and height
- Default homescreen position
- Visibility of the search bar

These items can be configured in a new Activity, which replaces the system
settings as target of the icon in overview mode.

Shortcomings:
- Bounds for cols, rows and defaultWorkspace may need to be adjusted
- When one of the values changes, the Launcher activity gets recreated
  completely.
- When searchbar is hidden, you also lose the visible hints for the
  remove/appInfo drop targets.

Change-Id: I5006d01f8a85e4daf3c3bb9a3dfb57c70e968878

Conflicts:
	res/values/cm_strings.xml