HelpM`: Use MFunction and MMethod with MArg & MOpt for ::usage (and consistent with the HelpF` and HelpO` registries)

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An MFunction object can generate a highly structured ::usage documentation String. Note that the generated help contains the same information as that registered with the HelpF` registry.

An MMethod object can similarly generate a highly structured ::usage-similar documentation String, which help contains the same information as that registered with the HelpO` class & methods registry. However, it's not clear how to actually use it with ::usage:

In any case, the help as stored in the HelpF` and HelpO` registries is far richer, is supported by many useful views and queries, and serves as the primary package function and class method documentation for Webel projects.


Overview of the Webel HelpM` package with MTools-based help helper classes

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