I've taken what aceMa provided in bug report and made it a replacement
for the square thumbs option rather than a new option as we don't need
two square thumb options.

I've tweaked it a bit more and hopefully have got the padding/ratio
stuff more consistent and not using hardcoded numbers so much

And getting it to show descriptions/captions below frame

Change-Id: Iafc0ec8a8132d1bef5401b3ebd49e3df013fddc3
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>