Add Input class

- Add Input class used to poll mouse and key button states
- Add additional example systems to the Scene

CopiumEngine/src/copium/example/CameraFollowPlayerSystem.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "copium/ecs/System.h"
+#include "copium/example/Components.h"
+
+namespace Copium
+{
+  class CameraFollowPlayerSystem : public System<PlayerC, TransformC>
+  {
+  public:
+    void RunEntity(Entity entity, PlayerC& player, TransformC& transform) override
+    {
+      TransformC& cameraTransform = player.camera.GetComponent<TransformC>();
+      glm::vec2 wantedPos = transform.position + transform.size * 0.5f;
+      cameraTransform.position -= (cameraTransform.position - wantedPos) * 0.10f;
+    }
+  };
+}