Moved the platform stuff around

src/platform/platform.h

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "microrpg.h"
+
+/**
+ * Initialize the platform-specific subsystem.
+ */
+void platformInit(void);
+
+/**
+ * Update the platform-specific subsystem.
+ */
+void platformUpdate(void);
+
+/**
+ * Render the platform-specific subsystem.
+ */
+void platformDraw(void);
+
+/**
+ * Dispose of the platform-specific subsystem.
+ */
+void platformDispose(void);