Add test using type in @module and @submodule

[BiterUnion]

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This PR adds a test using the @type tag in both a @module and @submodule. It shows that the generated docs are different for both cases:

Type2InModule is properly shown as a class, while Type2InSubmodule is not. Instead, only Type2InSubmodule's functions are shown.

[alerque]

This MWE looks great. I'll have to dig into how to trigger it so our CI starts showing the failure from this being a bug. Again I'll be traveling until mid October so not sure anything will get squeezed in from the road, but if anybody else wants to dig in to where the bug revealed by this MWE is I'll try to facilitate.