all: move headers to include folder

Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>

include/error.h

@@ -0,0 +1,36 @@
+#if defined __arm__
+#include <3ds.h>
+#endif
+
+/* Errors that can't be explained with errno */
+#define NDSP_INIT_FAIL			1000
+#define DECODER_INIT_FAIL		1001
+#define FILE_NOT_SUPPORTED		1002
+#define UNSUPPORTED_CHANNELS	1003
+
+#if defined __arm__
+
+/**
+ * Struct to help error handling across threads.
+ */
+struct errInfo_t
+{
+	/* errno code or from defines listed above */
+	volatile int*	error;
+
+	/* Extra information regarding error (Must be NULL if unused) */
+	volatile char*	errstr;
+
+	/* Event to trigger on error */
+	Handle*			failEvent;
+};
+
+/**
+ * Return string describing error number. Extends strerror to include some
+ * custom errors used in ctrmus.
+ *
+ * \param err	Error number.
+ */
+char* ctrmus_strerror(int err);
+
+#endif