Module-level custom dictionaries

Can dictionaries be defined in a module (rather than a project)? If so, how?

If a dictionary is defined in a module, does it only apply to files in that module, or does it apply to all files in a project?

If you can limit the scope of a dictionary to a module, is there a boolean for each module-level dictionary indicating whether to export that dictionary to all other modules that depend on that module?

Which dictionary formats (.dic, .xml, hunspell, etc.) are supported at module level? Is there any reason to prefer one format over another?

I'd want to store the dictionaries and related settings in the VCS repo for my modules / projects.

Thanks.