Implement multiple players

[IchordeDionysos]

I want to implement a support for multiple players:

In firebase I want to have multiple games located in the root of the firebase database, and every game has several properties, for example maxPlayers, the gameId and the map as a String which allows all users to generate the same map. Furthermore each game should contain an players array, which container a player object with some properties like top, left, rotation, which all specify the tanks transformation.
The structure should look something like this:

{
    --firebaseKeyGame1: {
        maxPlayers: 6,
        gameId: "Ghe7de",
        map: "[[[140,true,false,false,true], ...",
        players: {
            0: {
                top: 20,
                left: 180,
                rotation: 45
            },
            1: { ... },
            ...
        },
       --firebaseKeyGame2: { ... },
       ...
}

and you should be able to select a game from tmp-game and push it down to tmp-map, in tmp-map you should loop over all players to get all players displayed on the map

NOTE: already started this issue on multiple-players and multiple-players2

[IchordeDionysos]

The only thing which isn't working in multiple-players branch, is that it isn't firing the gameChanged observer and so it isn't pushing to firebase ...
No idea why ...