More GIMP Scripts to help remove text for localisation

These need mask images, which I haven't committed due to their size.
They were generated by combining all the images using the same
background in lighten only mode in the GIMP to eliminate text and
distinct images (and some manual cloning for common text, etc).

Once the mask is applied to the images they still need manual editing in
the GIMP to show wanted parts (images, etc) of the source image through.