API for programmatic usage

[Alduino]

This allows people to use pkg-lib without having to run the CLI. Generally people probably won't do this, but it is nice to have the option.

The API should export everthing that people could need, with each thing having good tsdocs as well. This probably includes every task and some of the utility functions. It might include the file watcher too.

We should then enable documentation generation too, which could be put into a website automatically.