label alignment, text direction, multi-line support options, and a different seBindLegend about elm-vegalite

[jwoLondon]

Thanks again for spotting the missing elements from the schema. I've added the alphabetic baseline, text direction and line height options.

I note that text mark literals (via tStr) allow for multi-line strings to be respected when providing a JSON array of strings, but not for encoded text data. Not sure if this is a Vega-Lite bug or feature, but for now I am not converting \n in encoded data into string arrays.

To avoid over-inflation of the API surface area, I currently do not intend to implement lineBreak as the \n seems to cover all the cases I can foresee (we could always transform input data with regex, find/replace etc. if we had to). If you think there is a compelling case for lineBreak, happy to add it though.

[jwoLondon]

Closing this for now as we don't seem to have a need for changing the default line break from \n.