Revert plugin redesign starting with the ABI/license check changes
This is a quite big revert going back to the plugin design in use in the last years. There was a very brief discussion before the plugin API redesign landed and the redesign did not come with a roadmap, a clear scope of the planned changes and most importantly a cost/benefit analysis.
The thread on wireshark-devel started here: https://www.wireshark.org/lists/wireshark-dev/202312/msg00000.html
I would like to reach a broad agreement on the direction and I won't merge this MR until it gets multiple approvals.
There were open questions in the thread and I'll start revisiting them tomorrow.