Volume can now be changed based on remembering the previous set volume.
Merge branch 'master' of https://github.com/BirdAPI/yamaha-network-receivers
Added a "SmartVolumeUp" and "SmartVolumeDown", which used with the Auto-repeat current macro and "SmartVolumeFinished" can make changing the volume have a little more acceleration. Check images/smart_volume.png for the proper setup of a macro.