Some clicks can be missed

[TkachenkoViacheslav]

Steps to reproduce (it's hard and not always reproducible):

1. disableSystemVolumeHandler = true
2. with a delay about 1-2 seconds click "up" -> "down" -> "up" -> "down" -> ...
3. On some time, pressing on the up/down button won't result in firing blocks, In code inside "public override func observeValue(...)" we are getting into the next If block:

if disableSystemVolumeHandler && newVolume == Float(initialVolume) {
                // Resetting volume, skip blocks
                we are here!
                return
} else { ... 

but in fact button press was detected and newVolume != oldValue

[TkachenkoViacheslav]

Solution:

1. the condition above should be changed to the:

if disableSystemVolumeHandler && newVolume == oldVolume {
                // Resetting volume, skip blocks
                return
} else { ... 

2. at the end of function "public override func observeValue(...)" the "Reset volume method" should be wrapped in an If statement:

// Reset volume
if newVolume != Float(initialVolume) {
            setSystemVolume(initialVolume)
}

[TkachenkoViacheslav]

I'm sorry, my solution is wrong. But the bug is actual