Function MultiplayerAPI.poll
Method used for polling the MultiplayerAPI. You only need to worry about this if you are using Node override or you set SceneTree to false. By default, SceneTree will poll its MultiplayerAPI for you.
Note: This method results in RPCs and RSETs being called, so they will be executed in the same context of this function (e.g. _process, physics, Thread).
void poll() nothrow @nogc;