Add OSD support

[jcbjoe]

Is your feature request related to a problem? Please describe. In C# it is possible to hook into the windows API and make custom OSD elements, it would be good if you could add it so that when changing volumes it will pop up a volume bar so you can see the application you are changing and its level

Describe the solution you'd like The solution I would like is to make an element pop up using the windows OSD that would show the user the application or output/input they are changing and a bar to show its volume

Describe alternatives you've considered none

Additional context This is the windows one:

A working sample can be seen here: https://github.com/microsoft/Windows-classic-samples/tree/master/Samples/Win7Samples/multimedia/audio/osd