Missing "mcuinterface.h" in latest trunk version

Don't forget to add the missing header file.

Best regards.

Sorry.
Solved in Rev 281.

Now I can compile latest trunk (0.5.16-RC4) but I have found two regressions:

- Arduino ADC inputs now seem to use a 2.5V internal reference instead of the default 5V reference. As a consequence, KY-023 middle position is now 1024 instead of 512.

- Audio Out no longer works. Neither controlled by an Arduino PWM output or as an stand alone buzzer.

Best regards.

Thanks.

Solved in Rev 282 & 283.