std: merge rand::{Rng,RngUtil} with default methods.
Also, documentation & general clean-up: - remove `gen_char_from`: better served by `sample` or `choose`. - `gen_bytes` generalised to `gen_vec`. - `gen_int_range`/`gen_uint_range` merged into `gen_integer_range` and made to be properly uniformly distributed. Fixes #8644. Minor adjustments to other functions.
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