"Player completes advancement" global trigger

Not applicable
Issue description

This would be very useful for creating additional rewards after completing advancements.

If combined with the "has player completed advancement" it could also trigger global variables which would change the gameplay (for example, a mob might only spawn after the enderdragon has been beaten for the first time).

Issue comments

Will there be, if it gets into mcreator, A block like what that Achievement / Advancement was, that he got?

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