Display Settings: Better font size control

Use a SeekBar instead of a list/spinner to determine the font scaling.
For consistency, an approximate size (small, normal, etc.)
 and the exact percentage are displayed.

Change-Id: I96f80d93e740a25a6a6890b423a41c3900b93767
Show a preview of the selected font size immediately

Modified the font size preference dialog to show the user the selected
font size immediately. Also split the size description and percentage on
their own lines to show a preview of two different font sizes. In
addition, removed the gigantic title bar from the dialog.

Change-Id: Ifc1e930f9420bde0bb6fd61b1a395c3d36b4fb0b
Show application's package name in the "App info" screen.

Change-Id: I7dac8ffa0b10abb5ff235750e90a96d801b2f919