I'm wondering what would be involved to make the `ign` tool and subtools like `ign topic` work with messages outside of ignition msgs. It seems like the ignition messages get some extra generated code, such as calls to `IGN_REGISTER_STATIC_MSG`, which make them discoverable by the ign tool. Can I get a brief explanation of how this works, and how I can get it to work with custom messages? I realize this may not be easy, but I'm willing to put in some work.
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