* Prepend underscores to private modules
* Remove collectUint8Arrays() It would be a misuse of Deno.iter()'s result.
* Move std/_util/async.ts to std/async
* Move std/util/sha*.ts to std/hash
refactor: Parse URLs more sequentially. This makes it easier to change matching behaviour depending on the protocol.
fix: Fail when a host isn't given for certain protocols.
fix: Convert back-slashes info forward-slashes.
