Added ability to insert pictures to Android Viewer.
You can take photo or select photo from device or
the cloud (Google photos, Dropbox). You can also
compress the picture before inserting it with multiple
compress grades. So far, inserting doesn't work for
Writer due LO native library issues (I think).

Change-Id: If6841ba04fe18585703c8b85909cf39747dbbc2f
Reviewed-on: https://gerrit.libreoffice.org/41150Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>