Add size parameter to imageTag helper in PDFs

[bmoree]

Is your feature request related to a problem? Please describe.
PDFs with a lot of images have a very large filesize because the original image is used whatever the height/width of the image. If we could instruct the system to use one of the available thumbnail sizes the filesize can be reduced drastically.

Describe the solution you'd like
Using the helper {{imageTag imageFieldNameId size=small|medium|large }} will output a version of the image based on the selected size.

Describe alternatives you've considered
Outputing the url with the ?size param inside the src of an img tag, but it keeps escaping the "&"

Additional context
Add any other context or screenshots about the feature request here.