Add Full Width to Mobile Layout Product Gallery#65

The current Product Gallery viewed on phones shows up with part of the next image if the image in current view has a white background. There are navigation dots that should be sufficient to inform the viewer that the product page gallery has multiple images since that has become a standard for a while.

So I suggest to provide an option in the Theme Editor for Product Gallery to have Mobile Layout -> Full-Width to offset this issue with portrait or natural image dimensions that are vertical.

In addition to the Full-width option, a second option of 75% width may also be given to the Mobile Layout for the product gallery.

Thanks