Wt

Wt currently holds a list of common MIME types, where very recently a selection was added with #10903.

This is still rather restrictive. If developers wish to use types that are not part of the list, they are stuck. We should allow for a way to expose these types, so that the default list can be modified.
The likeliest candidate is the wt_config.xml. This file, however, is already fairly big. If a nice alternative can be found, this would be ideal. Otherwise the config file will serve.