Cuttlebone 0.12.0

Milestone 12: documentation in hover, document and workspace symbols, and
completion of names. Report.

• Hover shows the declaration, after the type: its signature as the
  source writes it, Defined in its module and type, and its doc comment
  as Markdown, the text inko doc reads (a trait's for an implementation
  without its own). For std, dependencies and the project; on a
  declaration's own name too. Sections are separated by ---; the type
  is still the first code block where there's an expression.
• textDocument/documentSymbol: types, traits, impl blocks,
  methods, fields, constructors and constants, nested, with their
  signatures as detail, from the syntax alone: in code that doesn't type
  check, and (from a copy with lines blank, repaired) in code that
  doesn't parse. SymbolInformation[] for clients without hierarchy.
• workspace/symbol: the same declarations of the project, its
  dependencies and std, matched as clients filter (the characters in
  order, any case), the project's first, at most 500. Fresh with every
  file on disk and open document; nothing is written.
• Completion of names: variables in scope, what self has, fields
  after @, what the module binds, types in a type's name; public
  symbols of modules not imported, with additionalTextEdits that add the
  import as inko fmt would; modules and symbols in an import. @ is a
  trigger character. Names are isIncomplete. In code being edited, names
  come only where no declaration differs.
• No new extension, and the patch is unchanged.

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/v0.12.0/manifest.json
Every release, with its Inko versions and manifest:
https://github.com/setdef/Cuttlebone/releases/latest/download/index.json
(docs/releases.md).