* Store bitmaps directly instead of byte arrays.
* Store bitmaps with shadows instead of one set with shadows and another
  without them.

This change should optimize memory usage a bit.

Change-Id: Ied7ce57a660438a06167e8984d16a6f26ebd8c23
Reviewed-on: https://gerrit.libreoffice.org/2917Reviewed-by: Michael Meeks <michael.meeks@suse.com>
Tested-by: Michael Meeks <michael.meeks@suse.com>
Signed-off-by: Michael Meeks <michael.meeks@suse.com>