* 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
This commit was originally authored by @TabascoEye, then rebased and
improved by @pizkaz:
* refactors local user storage, adding audio player settings
* stores "muted" state of audio player in local store