Module category in asset library?

[jonri]

Godot has several ways to extend its default functionality - GDScript, GDNative libraries, and also modules that are compiled directly into the engine. The first two have a home here in the asset library, but there is no official collection of modules (although there are a couple unofficial ones).

It's understood that modules are not as easy for the user and the download/install functionality would not apply here, but adding a modules category might be a nice way to improve the visibility of the ones that are out there.

[menip]

See also #108