[FEATURE] General Volume Up and Down Accessories
The GeneralVolumeControl is buggy.  If you leave the number of commands to send blank, it defaults to -26, not 1 as stated in the plugin.  Furthermore, it is difficult to control how much the volume goes up or down given the slider.  I always turn it up too much and then down too much to compensate.

It would be great to have the option for individual general VolumeUp and VolumeDown accessory switches.

I know that individual accessories for specific devices can be added, but I could not find a way to do this for the current activity.
