8 people multiplayer using phones

Added server-client style multiplayer mode where your PC version of game will act as server and mobile app can connect to it.

This way game overcomes usual 4 player limitation. There are also less unneeded elements displayed on each sceen and tapping on the gem feels a bit more easier whan dragging cursor with a controller.

For this to work PC version must start Mobile multiplayer mode. Then other players join from phone app wile connected to the same WiFi network.