Nyall Dawson a7c39ffdc7 Add support for super and subscript HTML formatting in text renderer
This allows for either:

- <sup>superscript</sup> / <sub>subscript</sub> components in text,
where the text will be vertically super or subscript aligned
and automatically sized to 2/3rd of the parent font size. Users
can also set a fixed font size for the super/sub script by
including css rules, e.g. <sup style="font-size:33pt">super</sup>

- "vertical-align: super" or "vertical-align: sub" CSS formatting
rules in any other HTML element

Sponsored by OSGEO UK
2022-11-14 20:46:15 +10:00
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