Refactor december

[GrosSacASac]

No description provided.

[tunnckoCore]

@GrosSacASac

1. Plugins should return, plus this pluginResults event is useful for debugging or whatever. Plus it encourages not touching the this that much (by the plugin creators). Potential breaking change inside the v2/v3 for some custom plugin user or whatever.
2. old code as comments (use git) - code comments is exactly that 😆 , "using git" instead of Github or other social collab platform. OK, but just saying.

Anyway, thanks.

I was here after New Year, but I didn't seen these few things.

[GrosSacASac]

some plugins did not return anything, that is why, I attempted to make things more consistent

[GrosSacASac]

#820