Summary: Ref T4245. Prepare these scripts for a callsign-free world. This also makes them more flexible and easier to use. The following are now valid ways to identify a repository for these scripts: ID (`3`), PHID (`PHID-REPO-wxyz`), R<ID> (`R3`), r<CALLSIGN> (`rSKYNET`), CALLSIGN (`SKYNET`). In the future, a human-readable label (`skynet`) may also become valid. Test Plan: - Ran `bin/repository reparse --all ...` with `rX`, `X`, `3`, `R3`. - Ran `bin/repository reparse --change ...` with `rXaaa`, including short versions. - Ran `bin/repository update ...` with `rX`, `X`, `3`, `R3`. - Ran `bin/repository refs ...` with various identifiers. - Ran `bin/repository pull ...` with various identifiers. - Ran `bin/repository mirror ...` with various identifiers. - Ran `bin/repository mark-imported ...` with various identifiers. - Ran `bin/repository list`. - Ran `bin/repository importing ...` with various identifiers and examined output. - Ran `bin/repository edit ...` with various identifiers. - Ran `bin/repository discover ...` with various identifiers. Reviewers: chad Reviewed By: chad Maniphest Tasks: T4245 Differential Revision: https://secure.phabricator.com/D14924