Redefine ID types to be actual pointers

Redefined various ID types to be aliases of pointers instead of casting
a uintptr_t to the needed pointer.

e.g. SurfaceID = Surface*

engine/include/nova/platform/window_fwd.h

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2025, Jayden Grubb <contact@jaydengrubb.com>
+ * 
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#pragma once
+
+namespace Nova {
+	enum class WindowAPI { WAYLAND, WINDOWS, X11 };
+
+	class WindowDriver;
+
+	struct Window;
+	using WindowID = Window*;
+} // namespace Nova