Added support for the tempo command. Added trivial support for subtunes so I can use a song that has them as a test song. Fixed a warning in the ATmega build.
Added support for the tempo command.
Added trivial support for subtunes so I can use a song that has them as a test song.
Fixed a warning in the ATmega build.

gunnbr/SIDish,gunnbr/SIDish,gunnbr/SIDish