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

improve new project options

* Simplify new repo commands
* Include directions for how to add an existing folder that is either
already a repo or not yet a repo

Replaces #7918.