Add full HMR that actually somehow works!

package.json

@@ -88,6 +88,7 @@
     "@babel/preset-typescript": "^7.12.7",
     "@babel/register": "^7.12.10",
     "@babel/runtime": "^7.12.5",
+    "@pmmmwh/react-refresh-webpack-plugin": "^0.4.3",
     "@principalstudio/html-webpack-inject-preload": "^1.2.7",
     "@types/flux": "^3.1.9",
     "@types/modernizr": "^3.5.3",
@@ -140,6 +141,7 @@
     "postcss-scss": "^2.1.1",
     "postcss-simple-vars": "^5.0.2",
     "postcss-strip-inline-comments": "^0.1.5",
+    "react-refresh": "^0.10.0",
     "rimraf": "^3.0.2",
     "shell-escape": "^0.2.0",
     "simple-proxy-agent": "^1.1.0",