PWA service workers (#1319)

* PWA services worker

- [x] Register service worker of PWA to install WorkAdventure application on desktop and mobile
- [x] Create webpage specifique for PWA
- [ ] Add register service to save and redirect on a card
- [ ] Add possibilities to install PWA for one World (with register token if existing)

* Finish PWA strategy to load last map visited

* Fix feedback @Kharhamel

* Fix feedback @Kharhamel

front/dist/resources/service-worker.js

@@ -48,6 +48,14 @@ self.addEventListener('fetch', function(event) {
     );
 });
 
-self.addEventListener('activate', function(event) {
-    //TODO activate service worker
+self.addEventListener('wait', function(event) {
+    //TODO wait
+});
+
+self.addEventListener('update', function(event) {
+    //TODO update
+});
+
+self.addEventListener('beforeinstallprompt', (e) => {
+    //TODO change prompt
 });