Moved a bunch of code around

src/dusklinux/display/displayplatform.h

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "display/displaysdl2.h"
+
+typedef displaysdl2_t displayplatform_t;
+
+#define displayPlatformInit displaySDL2Init
+#define displayPlatformUpdate displaySDL2Update
+#define displayPlatformSwap displaySDL2Swap
+#define displayPlatformDispose displaySDL2Dispose