The `validate` command checks the status of the environment and reports any problems to the user.
This includes Python env and dep checks, typescript and typedoc checks of installed version and configuration files (to varying degrees).
Also:
- Convert `mkdocs.js` to TS; remove `assertMkDocs` as that moved into the `validate` module
- JSON5 support for `tsconfig.json` (this is important, because the default `tsconfig.json` is a JSON5 file)
- Sorted the options in the `cli` module
- Renamed `types` to `model`
- Moved some constants into new module `constants`
This provides some tools for extension authors to easily setup and configure their packages to build docs and create documentation via TypeDoc & mkdocs.
Christopher Hiller