Add new methods to input handler, add RectangleShape2d, modify test game.

TestGame/TestPlayer.cs

@@ -0,0 +1,25 @@
+using DaggerFramework;
+using DaggerFramework.SceneGraph;
+using DaggerFramework.Utils;
+
+public class TestPlayer : RectangleShape2d
+{
+    protected override void OnStart()
+    {
+        base.OnStart();
+        Color = Color.Cyan;
+    }
+
+    protected override void OnUpdate(double dt)
+    {
+        base.OnUpdate(dt);
+
+        var sprinting = Input.IsActionDown("sprint");
+        _speed = sprinting ? 400f : 200f;
+
+        var velocity = Input.GetInputDirection("left", "right", "up", "down") * _speed;
+        Position += velocity * (float)dt;
+    }
+
+    private float _speed = 200f;
+}