Migrate to vite and some more stuff

- server: add a `Track` class
- server: add a create_track_class function
- client: migrate from vue-cli to vite

package.json

@@ -3,16 +3,16 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "serve": "vue-cli-service serve",
-    "build": "vue-cli-service build",
-    "lint": "vue-cli-service lint"
+    "dev": "vite",
+    "serve": "vite preview",
+    "build": "vite build",
+    "lint": "eslint --ext .js,.vue --ignore-path .gitignore --fix src"
   },
   "dependencies": {
     "animate.css": "^4.1.1",
-    "core-js": "^3.6.5",
     "mitt": "^3.0.0",
     "register-service-worker": "^1.7.1",
-    "sass": "^1.44.0",
+    "sass": "^1.49.0",
     "sass-loader": "^10",
     "vue": "^3.0.0",
     "vue-debounce": "^3.0.2",
@@ -20,14 +20,10 @@
     "webpack": "^5.64.4"
   },
   "devDependencies": {
-    "@vue/cli-plugin-babel": "~4.5.0",
-    "@vue/cli-plugin-eslint": "~4.5.0",
-    "@vue/cli-plugin-pwa": "~4.5.0",
-    "@vue/cli-plugin-router": "~4.5.0",
-    "@vue/cli-service": "~4.5.0",
+    "@vitejs/plugin-vue": "^1.6.1",
     "@vue/compiler-sfc": "^3.0.0",
-    "babel-eslint": "^10.1.0",
-    "eslint": "^6.7.2",
-    "eslint-plugin-vue": "^7.0.0"
+    "eslint": "^8.7.0",
+    "eslint-plugin-vue": "^8.3.0",
+    "vite": "^2.5.4"
   }
 }