Room Name Sanitisation

Room names now remove any non-alphanumeric characters and are converted to lowercase.
Material theme has been changed to black fixing the purple outline on the room name entry box.

Change to room name handling makes this version potentially incompatible with clients running outdated versions.

Bug Fixes

Fixes issue #11 (player number can be reduced to 0 in offline mode).

Database Wordlist

Retheme app from last version.
Add download of wordlist from Firestore database with hardcoded JSON fallback.

New York Background

Fix issue where the background image was a picture of Paris instead of New York.

Photo by Oliver Niblett on Unsplash:
https://unsplash.com/photos/wh-7GeXxItI

Online Mode Using Firebase

Adds an optional online mode - multiple players join a single room instance on different devices.
Online mode rooms are hosted using a Firebase Cloud Firestore.

Progressive Web App

Progressive web app that can be added to home screen and functions offline.
90+% on all Lighthouse audits.

Base Web App

Web app is functional with a sample word list of 24 words in 3 categories.