Remove `random` package `Random` prefixes.

[terrorbyte]

Having every function prefixed with Random is redundant and can sometimes cause more confusion than it helps. This is a pretty big change and should not be merged until supported packages can change.

[j-baines]

This would break the API. Unless you are proposing a major version bump, which I'd be hard pressed to agree with, this is sort of DOA. While I agree that the naming scheme is imperfect, it's certainly not worthy of breaking others integrations nor introducing a major version update.

[terrorbyte]

Fair and reasonable. I considered deprecating the old functions but leaving them to keep stability. I'll make a issue and maybe add a "api-break" change comment leading here.