Implement ext:typo3_encore, update webpack

package.json

@@ -6,7 +6,7 @@
   "license": "WTFPL",
   "repository": "https://gitlab.com/dreipunktnull/ep_theme.git",
   "scripts": {
-    "dev": "./node_modules/.bin/encore dev --watch --watch-poll 1000",
+    "dev": "./node_modules/.bin/encore dev --watch --watch-poll 500",
     "build": "./node_modules/.bin/encore production"
   },
   "dependencies": {
@@ -33,16 +33,15 @@
     "vuex": "^3.1.0"
   },
   "devDependencies": {
-    "@symfony/webpack-encore": "^0.19.0",
+    "@symfony/webpack-encore": "^0.28.2",
     "autoprefixer": "^8.6.5",
     "babel-plugin-syntax-dynamic-import": "^6.18.0",
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "node-sass": "^4.11.0",
-    "postcss-loader": "^2.1.6",
-    "sass-loader": "^6.0.7",
-    "vue-loader": "^14.2.4",
-    "vue-template-compiler": "^2.6.10",
-    "webpack-notifier": "^1.7.0"
+    "postcss-loader": "^3.0.0",
+    "sass-loader": "^7.3.1",
+    "vue-loader": "^15.8.3",
+    "vue-template-compiler": "^2.6.10"
   },
   "browserslist": [
     "last 2 versions",