Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-06-15 00:05 b134b2f5

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refactor(set_theory/game/state): rename pgame.of to pgame.of_state (#14658) This is so that we can redefine pgame.of x y = {x | y} in #14659. Further, this is just a much clearer name.

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