Dynamic Connection: Remove Signal Connection Boilerplate

This plugin adds the DynamicConnection class for handling a signal/callable connection and modifying it during runtime.

DynamicConnection represents a connection between a Signal and a Callable or the absence of one. This class ensures there's at most only one connection and avoids leaving leftover connections if its state ever changes.

Example use

extends Node2D
var _button_connection = DynamicConnection.new()

func _ready():
    var button1 = Button.new()
    var button2 = Button.new()
    # Connects "button1.pressed" signal to method "hide"
    _button_connection.set_connection(button1.pressed, hide)
    # Removes the old connection,
    # and connects the signal "button2.pressed" to "hide"
    _button_connection.set_signal(button2.pressed)
    # With the call below, "button2.pressed" is no longer connected
    # to "hide", but instead to the method "show"
    _button_connection.set_callable(show)
    # Disconnects "button2.pressed" from "show"
    _button_connection.remove_connection()