core: change types from uint32_t to u32 (e.g)

headers/icon.h

@@ -1,9 +1,10 @@
 #pragma once
 
+#include "types.h"
 #include <stdint.h>
 
 struct icon {
-	uint32_t height;
-	uint32_t width;
-	uint32_t *pixels;
+	u32 height;
+	u32 width;
+	u32 *pixels;
 };