[UPD] Swift 6 Migration

[IMP] some deprecations

[IMP] Upgraded => precedence

[ADD] !?= operator.

[ADD] =? operator

[IMP] Documentation

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[ADD] ** for SIMD

[ADD] ||= and &&= operators

[ADD] !!! Operator

[ADD] |>, <|, |>= and <=| operators

[ADD] <-? operator