Made multiple managers for individual pieces

Added UIManager that renders the UI inside the window

BarinkEngine/Include/Input/InputManager.h

@@ -0,0 +1,18 @@
+#pragma once
+#include <vector>
+
+#include "Graphics/Window.h"
+
+namespace BarinkEngine {
+
+	class InputManager {
+	public:
+		InputManager();
+
+		void PollEvents();
+		void attach(BarinkWindow* window);
+
+	private:
+		std::vector<BarinkWindow*> windows;
+	};
+}