Add validate. Add strength score. Add strength level in multiple lang…

…uages. Upd rust-version. Doc refactoring. Rel v1.3.0

upd rust-version, upd dep rand lib & doc refactoring, rel v1.2.1

upd rust-version & edition, upd dep rand libs & code refac, rel v1.2.0

prep v1.1.0

some refactorings v1.0.4

readme fix

readme fix

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