Add: Networked Signals (Simple yet more versatile then RPC)

[i-right-i]

I have created this feature via gdscript (code still in flux). It would be a nice feature built in to the engine instead of purely scripted.

The code I use to achieve this feature is a basic abstraction with a auto-loaded script (Godot's almost Singleton) with an API similar to this.

#Sender
NetworkSignal.set_peer(peer_to_sent_to)
NetworkSignal.send(signal_id, varant_to_sent)

#Receiver
 NetworkSignal.signal_id.connect(function_to_register)