Plugin API information sought

[Antipole]

Developers... a request for elucidation...

In ocpn_plugin.h we find the APIs for creating and handling context menus, viz:

• AddCanvasContextMenuItem
• RemoveCanvasContextMenuItem
• SetCanvasContextMenuItem etc.

This is all clear and straight forward.

I also espy a set of APIs without the Context bit, e.g.

• AddCanvasMenuItem
• RemoveCanvasMenuItem
• SetCanvasMenuItem etc.

Peeking at the code in OpenCPN, the former appears to mostly be implemented through the latter's internal mechanisms.
Please can someone explain what the latter set are for? And point me to plugins that use them?

My hunch is that the CanvasMenu set was implemented first and then superseded by the CanvasContext set, which might now be relicts.