Export linespacing attribute of text.
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lucasb-eyer
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This adds or fixes support for the following matplotlib axis title (ax.set_title) features: - newlines: SVG `<text>` can't do that, need to use `<tspan>`s inside, see also [this SO q/a](https://stackoverflow.com/questions/16701522/how-to-linebreak-an-svg-text-within-javascript). - linespacing: naturally follows from wanting newlines. Needs exporter support, so PR mpld3/mplexporter#77 first. - left/right titles were completely missing; this adds support for those, which also needs exporter support, so this PR first: mpld3/mplexporter#78 - The `malign` property, which defines in the multi-line case, how the text lines should be aligned (all left, all center, all right). I made this with major help from gpt-codex-5.2, although in the end I went over all of its code and did a little simplifications here and there, needed multiple iterations overall.
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This is only the exporting. I'll make a PR with the rendering-side of this tomorrow, but ideally we just merge this one as it's trivial :)