add some debugging overlays

scenes/debugger/Debugger.tscn

@@ -0,0 +1,43 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://scenes/debugger/StateDebugger.cs" type="Script" id=1]
+[ext_resource path="res://scenes/debugger/FPS.cs" type="Script" id=2]
+
+[node name="Debugger" type="CanvasLayer"]
+
+[node name="Control" type="Control" parent="."]
+anchor_right = 1.0
+anchor_bottom = 1.0
+
+[node name="VBoxContainer" type="VBoxContainer" parent="Control"]
+
+[node name="HBoxContainer" type="HBoxContainer" parent="Control/VBoxContainer"]
+margin_right = 40.0
+margin_bottom = 14.0
+
+[node name="Label" type="Label" parent="Control/VBoxContainer/HBoxContainer"]
+margin_right = 26.0
+margin_bottom = 14.0
+text = "FPS:"
+
+[node name="Label2" type="Label" parent="Control/VBoxContainer/HBoxContainer"]
+margin_left = 30.0
+margin_right = 30.0
+margin_bottom = 14.0
+script = ExtResource( 2 )
+
+[node name="HBoxContainer2" type="HBoxContainer" parent="Control/VBoxContainer"]
+margin_top = 18.0
+margin_right = 40.0
+margin_bottom = 32.0
+
+[node name="Label" type="Label" parent="Control/VBoxContainer/HBoxContainer2"]
+margin_right = 36.0
+margin_bottom = 14.0
+text = "State:"
+
+[node name="Label2" type="Label" parent="Control/VBoxContainer/HBoxContainer2"]
+margin_left = 40.0
+margin_right = 40.0
+margin_bottom = 14.0
+script = ExtResource( 1 )

scenes/debugger/FPS.cs

@@ -0,0 +1,15 @@
+using Godot;
+using System;
+
+public class FPS : Label
+{
+    public override void _Ready()
+    {
+        
+    }
+
+    public override void _Process(float delta)
+    {
+        Text = Engine.GetFramesPerSecond().ToString();
+    }
+}

scenes/debugger/StateDebugger.cs

@@ -0,0 +1,18 @@
+using Godot;
+using System;
+
+public class StateDebugger : Label
+{
+    private Event _event;
+
+    public override void _Ready()
+    {
+        _event = GetNode<Event>("/root/Event");
+        _event.Connect("DebugState", this, "OnDebugState");
+    }
+
+    private void OnDebugState(string state)
+    {
+        Text = state;
+    }
+}