Cuttlebone 0.16.0

Milestone 16: answers a client that relies on Cuttlebone lost:
diagnostics past a module that doesn't parse, implementations,
hierarchies and file renames past a declaration error elsewhere, code
lenses with every declaration's implementations and supertypes in one
request, a status for every file rename, a selection step with a
declaration's doc comment, and a trait's required and default methods.
Report.

• Diagnostics past a module that doesn't parse: the rest of the
  project is checked without it and what imports it, as inko check
  checks a copy of the project without them; those keep inko check's.
• Implementations, incoming calls, supertypes, subtypes and file
  renames past a declaration error elsewhere: refused only where a unit
  the error makes unsafe names what they're about, as references; so
  callers also in a document being edited.
• Code lenses (textDocument/codeLens, for a client with them):
  every declaration's implementations and supertypes, and each impl's
  trait and its methods' trait's methods, in one request, with their
  locations in the command's arguments, and covered in the status.
• A status for every file rename, fresh where no module's name
  changes, naming the request's files.
• A selection step with a declaration's doc comment.
• A trait's default methods have { ... } after the signature in
  document symbols' detail; required ones don't.
• For Inko 0.21.1, as before. Seven patch lines (a project check can leave files out), no new extension.

Each archive works with one Inko version, which its name says.
Machine-readable list of the builds, with sizes and SHA-256:
https://github.com/setdef/Cuttlebone/releases/download/v0.16.0/manifest.json
Every release, with its Inko versions and manifest:
https://github.com/setdef/Cuttlebone/releases/latest/download/index.json
(docs/releases.md).