fix event embed filters + new clipboard mixin

package.json

@@ -41,7 +41,7 @@
     "express-oauth-server": "lesion/express-oauth-server#master",
     "http-signature": "^1.3.6",
     "ical.js": "^1.4.0",
-    "ics": "^2.31.0",
+    "ics": "^2.35.0",
     "jsdom": "^18.1.1",
     "jsonwebtoken": "^8.5.1",
     "linkify-html": "^3.0.4",
@@ -61,7 +61,6 @@
     "umzug": "^2.3.0",
     "v-calendar": "2.3.4",
     "vue": "^2.6.14",
-    "vue-clipboard2": "^0.3.3",
     "vue-i18n": "^8.26.7",
     "vue-template-compiler": "^2.6.14",
     "vuetify": "^2.6.1",