Workspace image limit

Description of the limitation and why it is relevant to address

I would like to upload workspace images larger than 300kB.

I think this is relevant for the VIKTOR platform because it reduces some difficulty when adding new apps. This limit on client side is unnecessary as this can be easily achieved on server side when processing the image.

Submitter proposed design (optional)

Reduce the image size on server side when processing the user input.

Current workarounds

A lot of cursing and time wasted when trying to reduce images myself using Gimp and such.