Update core headers and sources to use relative includes

src/core/os/mem/mem_os.c

@@ -1,15 +1,15 @@
 #include "mem_os.h"
 #include "mem_os_ops.h"
-#include "aliases.h"
-#include "platform.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/platform/platform.h"
 #include <assert.h>
 #include <stdbool.h>
 #include <string.h>
 
 #if defined(WAPP_PLATFORM_WINDOWS)
-#include "mem_os_win.h"
+#include "win/mem_os_win.h"
 #elif defined(WAPP_PLATFORM_POSIX)
-#include "mem_os_posix.h"
+#include "posix/mem_os_posix.h"
 #else
 #error "Unrecognised platform"
 #endif