* copy-tex contrib module
* Factor out replacement code
* Fix lint
* Support for more browsers, in particular Firefox
* Use for loop instead of Array.forEach
* Use replaceChild if replaceWith is unavailable
* Browserify to remove let etc.
* Fix HTML handling, in particular for Edge
* Convert DocumentFragment to HTML directly (via children' outerHTML)
* Set HTML content *before* text content; Edge takes the last only
* Handle .katex-html and .katex-mathml separately
* Implement option 2: CSS user-select: all
Also fix auto-render.js build location
* Revise documentation according to @kevinbarabash's comments
* Split copy-tex.js into it + katex2tex.js
This supports re-use of code in a custom copy handler.
* Document custom copy handler
* Add missing file
