Delest 0.1.1

Delest is now open source, under the MIT licence.

Added

• Install the local AI from the app (Settings › AI): the llama.cpp engine built for
  the system and the two models, on a click, after a summary of what will be downloaded,
  with a progress bar. A copy of a model already in another tool's cache is cloned
  rather than downloaded. delest models engine with no path does the same for the
  engine.
• Every model and engine file is checked against its published SHA-256 fingerprint
  before it is kept; an engine that does not start on the system is not kept.
• CONTRIBUTING.md and SECURITY.md.

Known limits

• llama.cpp's builds need macOS 13.3 or later, and on Windows a Visual C++ runtime 14.40
  or later; Delest says so and gives the way to get one, and still installs the models.