Allow user-defined images for legend groups and layers

[jbirch]

With other mapping applications, I have often found that I want to group several layers together as a single entity to keep maps as simple as possible for my users. As well, the generated legend symbols for layers can be non-optimal for presenting the user with a cartographically accurate key to the map.

It would be extremely useful if layer groups and individual layers could have their legend representations (folder icon as well as expanded "theme" image) manually overridden to point to a user-provided resource, stored in the repository.

I would expect that these would have width and height requirements for icons, and a width requirement for theme images.

Jason

[jbirch]

I have no idea what component this actually belongs under.