Allow use as a remote client

Added the /host command.

Updates and tidying

Updating dependencies and tidying up the code in respect to linting and type checking; the latter especially coming on the back of ollama-python now being seen by mypy as typed.

Retain conversation between runs

The main change in this release is that we keep a copy of the conversation between runs, and load it back up again when we're run up again. Also a bunch of UI improvements and small tweaks.

Initial release

Initial release to PyPI and via my homebrew tap.