* Improve service worker
- Add new env variable in WebPack "NODE_ENV"
- Add new service worker for mode dev that permit to by pass response in cache storage
- Add new WorkAdventure icon
* Remove console.log
* Add service worker file prod and dev
* 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
Turning the "importsNotUsedAsValues" TS config value to "error".
This will require us to use `import type` instead of `import` when we are importing a value that is only used as a type (and therefore that is dropped by the Typescript compiler).
Why this change?
This is a requirement to be able to use Svelte in the future. See https://github.com/sveltejs/svelte-preprocess/issues/206#issuecomment-663193798
