Also, tables! (╯°□°）╯︵ ┻━┻)

Prior it would return the project from the current context, which wasn't
the intended behavior.

[ci skip]

This will allow for the removal of a lot of duplication from the
reference filters.

For simplicity's sake, since we're testing the actual referencing, we
just force the permission check to always be allowed.

Commit ranges, commits, external issues, issues, labels, merge requests,
snippets, users.

Bootlint integration

Clean up code around commit mentions.

Builds upon !527.

See merge request !528

Revert disallowing usernames to end in period.

cc @JobV @jacobvosmaer

See merge request !545