Add core game components including ConfigFileHandler, GameManager, SaveSystem, and UIManager

scripts/Screenshot.cs

@@ -0,0 +1,15 @@
+using Godot;
+
+namespace Mr.BrickAdventures.scripts;
+
+public partial class Screenshot : Node
+{
+    public override void _Process(double delta)
+    {
+        if (!OS.IsDebugBuild() || !Input.IsActionJustPressed("screenshot")) return;
+        var img = GetViewport().GetTexture().GetImage();
+        var id = OS.GetUniqueId() + "_" + Time.GetDatetimeStringFromSystem();
+        var path = "user://screenshots/screenshot_" + id + ".png";
+        img.SavePng(path);
+    }
+}