Add create-meta subcommand

[qubixes]

This adds a command to complete the whole pipeline from the command line.

I have added an INI parser to set the specs. An INI file is not ideal, because it has not nesting. However, it is easier to work with than JSON/YAML files, for which you can easily create parsing errors.

fixes #143

[Samuwhale]

I have not tested it yet, but the code looks good. Just a few very tiny suggestions, but that's it.

[Samuwhale]

Might be nice to explain here that the input CSV has to be a tabular dataset? Not sure if the sentence would be too long then

[qubixes]

Isn't a CSV file always a tabular dataset though?

[Samuwhale]

I suppose they often are, you're right. That said, not everyone might be aware of that, in which case it is a lot more user-friendly to ask for an input tabular dataset, despite being redundant (IMO). It doesn't hurt, that's for sure. But if you like it more this way that is cool too.

[vankesteren]

Looks good! Let's merge. In the documentation, we might want to include an example config file. Actually, we can now create CLI documentation yeah?

[Samuwhale]

Looks good! Let's merge. In the documentation, we might want to include an example config file. Actually, we can now create CLI documentation yeah?

I have merged it! There actually already is some CLI documentation, but I'm working on documenting this PR as we speak :)