More lua integration work (proof-of-concept) #20851
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This simply makes the plugin system support lua, and adds a whole bunch of functionality to our lua contexts. Note: Hook functionality is still missing so all you can really do with this is binary patches on startup currently, and print to the log.
Unfortunately I've ran into the issue now that you can't safely save/load a complete lua state, it's just not possible to do the way they're designed. But we can probably approximate it well enough by reloading scripts on save state load, and saving/restoring any global variables on top. It will be pretty complicated now and the plugins will need to be aware of some restrictions.