Add EventBus, SpeedRunManager, and GhostManager; implement ghost recording and playback features

Autoloads/EventBus.cs

@@ -0,0 +1,9 @@
+using Godot;
+
+namespace Mr.BrickAdventures.Autoloads;
+
+public partial class EventBus : Node
+{
+    [Signal] public delegate void LevelStartedEventHandler(int levelIndex, Node currentScene);
+    [Signal] public delegate void LevelCompletedEventHandler(int levelIndex, Node currentScene, double completionTime);
+}