Add LaTeX / math input and rendering support (#345)

* Initial display support

* Use better colors for error in math parsing

* Parse math markdown

* Use proper jsx

* Better copy support

* use css var directly

* Remove console.debug call

* Lazy load math module

* Show fallback while katex is loading

package.json

@@ -27,10 +27,12 @@
     "flux": "^4.0.3",
     "formik": "^2.2.9",
     "html-react-parser": "^1.4.11",
+    "katex": "^0.15.2",
     "linkifyjs": "^2.1.9",
     "matrix-js-sdk": "^17.0.0",
     "micromark": "^3.0.10",
     "micromark-extension-gfm": "^2.0.1",
+    "micromark-extension-math": "^2.0.2",
     "micromark-util-chunked": "^1.0.0",
     "micromark-util-resolve-all": "^1.0.0",
     "micromark-util-symbol": "^1.0.1",