StoneCypher / jssm / 5b3396918ef669ad1bf2248240e871e3f8ad621c

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fix: use provided rng in weighted_rand_select instead of Math.random()

weighted_rand_select accepted an rng parameter but always used Math.random(),
ignoring the seeded PRNG passed by the machine for probabilistic transitions.
Now uses the provided rng when available, falling back to Math.random().

Also threads the rng parameter through weighted_sample_select and
weighted_histo_key, and exports gen_splitmix32 for external use.

Fixes @stonecypher/fsl#1316

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