add reset sketch and reorganize files

spybug/io.cpp

@@ -0,0 +1,19 @@
+#include "io.hh"
+
+static int serial_putch(char c, FILE *f) {
+	(void)f;
+	return Serial.write(c) == 1 ? 0 : 1;
+}
+
+static int serial_getch(FILE *f) {
+	(void)f;
+	while(Serial.available() == 0);
+	return Serial.read();
+}
+
+static FILE serial_in_out;
+
+void io_setup() {
+	fdev_setup_stream(&serial_in_out, serial_putch, serial_getch, _FDEV_SETUP_RW);
+	stdout = stdin = stderr = &serial_in_out;
+}