* Add automatic error reporting with Sentry.io
* Filter a bunch of bad errors from showing up on Sentry
* Add module.hasModule method.
* Fix deep_copy
* Fix disallow mouse interaction with extensions
* Add some new icons to the icon font for mod cards
* Allow Ctrl-Shift-Clicking emotes.
* Rarity sorting for experiments and unset display for unused experiments.
* Configure the project to allow the use of JSX in .jsx files.
* Add linting for JSX.
* Rewrite most existing code that uses `createElement` to use JSX syntax.
* Stop importing `createElement as e`. That's what the minifier is for. And we don't have to write it manually so much now because of JSX syntax.