Add EventManager and event handling system; implement event triggering and popup display

Scripts/Core/EventDefinition.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using Godot.Collections;
+using ParasiticGod.Scripts.Core.Effects;
+
+namespace ParasiticGod.Scripts.Core;
+
+public class EventDefinition
+{
+    public string Id { get; set; }
+    public string Title { get; set; }
+    public string Description { get; set; }
+    public int MeanTimeToHappen { get; set; }
+    public EventTriggerDto Trigger { get; set; }
+    public List<EventOptionDefinition> Options { get; set; } = [];
+}
+
+public class EventOptionDefinition
+{
+    public string Text { get; set; }
+    public string Tooltip { get; set; }
+    public Array<Effect> Effects { get; set; }
+}