basic song access, previews, difficulties

package.json

@@ -10,6 +10,7 @@
     "start": "webpack-dev-server --host 0.0.0.0 --progress --colors --hot --inline --port 3000"
   },
   "dependencies": {
+    "@zip.js/zip.js": "2.4.12",
     "aframe-aabb-collider-component": "^3.1.0",
     "aframe-atlas-uvs-component": "^2.1.0",
     "aframe-audioanalyser-component": "^5.2.1",
@@ -33,6 +34,7 @@
     "babel-minify-webpack-plugin": "0.2.0",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-stage-0": "6.24.1",
+    "beatsaver-api": "^2.1.4",
     "body-parser": "1.18.2",
     "classnames": "^2.2.5",
     "css-loader": "^0.28.7",