Better share/Remove "Search game by ID"

[JorenC]

In the original Android app, "Search game by ID" was there because there was no game sharing function.

However, now that we have 'share links' it's a bit outdated.
I want to change this:

1. Create a proper share functionality using the Web Share API: https://www.telerik.com/blogs/using-web-share-api-react
2. Remove "Search game by ID"
3. Add diplicity.com link handler in the Android App Manifest (requires some extra proof of ownership tests as described here), allowing the Android App to open these links directly: https://developer.android.com/training/app-links/deep-linking

[JorenC]

Better share implemented for 'invite' in the game menu, 'share' and 'invite' in the overflow menu.
TBD: Game Master mode.

[JorenC]

Web API created. However, we still need to have a way to open links in the Android app - e.g. handling the links in the manifest