* Remove forced \normalsize in \raisebox
Fix#1786 (incorrect size of "E" in `\TeX`) by fixing `\raisebox` to
keep the current font size. Previously, `\raisebox` was rendering its
second argument as if it were in `\normalsize\textrm{...}`; now,
the argument is just as if it were in `\textrm{...}`.
* Fix screenshots
* New "hbox" argument type to convert box-like arguments
* Review comments
* Fix \fbox to use hbox argument
* Render A in \LaTeX and \KaTeX in \scriptstyle (not \scriptsize)
* Add screenshot test
* Revert .sizing { width: min-content} thanks to #2044
* Define the nested version of ParseNodes structs explicitly.
Passes test:jest, but fails test:flow.
* Fix additional type errors reported by flow.
* Migrate rebased code from master.
* Rename ParseNode.js to parseNode.js.
* Update defineEnvironment output type to fix the flow errors in environment/array.js.
* Correct (type-wise) raisebox's usage of sizing's buildHtml.
* Move HTML and MathML groupTypes into defineFunction.
Currently, functions defined in functions/* import all exports from buildHtml
and buildMathML, but they should never use `groupTypes` directly as it loses
type-safety. They should instead use more type-safe `htmlBuilder`s and
`mathmlBuilder`s exported directly from other definitions `functions/*` to allow
flow to catch errors.
* Rename groupTypes to groupBuilders.
