Deprecate DataAttr, StyleAttr, TitleAttr, FormEl

This change addresses #170 by deprecating some HTML helpers in favor of using one of the styles as a main one,
selected based on what I think is the main use case.

- For `Data`, it's the attribute. I don't see much use of the `<data>` element in the wild.
- For `Style`, it's the attribute. The `style` attribute is everywhere, the `<style>` element is perhaps less so (but not much). This was the hardest one to decide.
- For `Title`, it's the attribute. The `<title>` element only shows up once per document.
- For `Form`, it's the element. I haven't seen much use of the `data` attribute in the wild.

I know this is arguably not a "consistent" approach, but I think it makes for a much nicer API, simply because the most-used option will not be a suffixed version.

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