Add playwright and http-server

Author: Stuk

package-lock.json

@@ -47,9 +47,11 @@
     "grunt-contrib-jshint": "~1.0.0",
     "grunt-contrib-uglify": "~4.0.1",
     "grunt-saucelabs": "Stuk/grunt-saucelabs#v10.0.0",
+    "http-server": "^13.0.2",
     "jshint": "~2.9.1",
     "jszip-utils": "~0.0.2",
     "package-json-versionify": "1.0.2",
+    "playwright": "^1.15.2",
     "qunit": "~2.9.2",
     "tmp": "0.0.28"
   },