Improve error handling

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

source/error.h

@@ -1,5 +1,15 @@
+#include <3ds.h>
 
 /* Errors that can't be explained with errno */
 #define NDSP_INIT_FAIL		1000
 #define DECODER_INIT_FAIL	1001
 #define FILE_NOT_SUPPORTED	1002
+
+struct errInfo_t
+{
+	volatile int*	error;
+	Handle*			failEvent;
+	volatile char*	errstr;
+};
+
+char* ctrmus_strerror(int err);