@excalidraw/extensions
`src/excalidraw-app/subtypes` to leave `@excalidraw/excalidraw` untouched. `@excalidraw/extensions` mostly contained boilerplate and obscured the main new features here: `ExcalidrawElement` subtypes and MathJax support.
This reverts commit 456433e8f0.
456433e8f0
Incorporates PR mathjax/MathJax-src#854 by @masx200.