Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-03-19 19:33 49cd1cc6

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refactor(analysis/seminorm): move topology induced by seminorms to its own file (#12826) Besides the copy and paste I removed the namespace seminorm from most parts (it is still there for the boundedness definitions and statements) and updated the module docstrings. No real code has changed.

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