mathlib3

2e140f1e - refactor(algebra/inj_surj): more lemmas, move to files, rename (#3290)

refactor(algebra/inj_surj): more lemmas, move to files, rename (#3290) * use names `function.?jective.monoid` etc; * move definitions to different files; * add versions for `semimodules` and various `*_with_zero`; * add `funciton.surjective.forall` etc.