Allow changing product image per unique quote

A lot of the time, products don't have images, however we cannot simply add one without having access into the product catalog. Quote users should be able to change the image per product/line item and upload an image from their local machine or using a hot link URL that doesn't affect the product catalog image.

I suggest keeping the UI faster by simply making it so click on the image will open up a larger preview of the existing image, if any, but if it's empty, then it will have a [Browse] button for local file or remote link option for URL. This should cover all basis.

Consolidated into: Possibility to copy / paste "Logo / Product image" from one product to the other