Updates for action menus

Sync with UX designs for action menus in split action bar mode.
Layout is now based on a grid cell scheme.

Tweak action menu item layouts.

Fix some bugs with drawing LinearLayout dividers.

Rename config resources to follow convention.

Action bar menu items now show text in ALL CAPS. This is done in a
locale-dependent manner, but if it produces problems in specific
locales the config resource config_actionMenuItemAllCaps should be set
to false for that locale.

Change-Id: I064c2dd85e012e89551f29153efcfc17f9106333