* Improve SVG Performance
This PR introduces three new classes: `svgNode`, `pathNode`, and `lineNode`. SVG data is then loaded into the domTree exclusively via instances of these classes.
`innerHTML` is banished.
* Fix lint errors
* Fix \cancel typo
* Fix sqrt height
* Adjust min-lenght
Adjust some of the extensible arrows to get a min-length that matches glyph length of the long arrows in KaTeX Main font range from Unicode 27F5 to 27FC.
The accent arrows still get min-lengths that match the arrows in the Unicode 2100 range.
* regenerate screenshots after optimizing SVG code
* update DisplayStyle screenshot for Chrome
* update OverUnderset and Smash screenshots for Chrome as well
* Remove escapes from template strings
* Pick up review comments
* Fix lint errors
* Add comments
* Rough support for \raisebox
* Fix bounding box thanks to @kevinbarash and @ronkok
* Use calculateSize to support all currently supported units (ex, em, mu).
* Shift height and depth in all cases.
* Add screenshot test
* Rename transform -> raisebox
* Switch to normalsize in raisebox
* Attempt at using makeVList
* Significant rewrite, now working well
* rename textFunctionStyles to textFunctionFonts
