Simultaneous recording and playback device selection

[JFish222]

As mentioned in #36, it would be VERY helpful to see both recording device and playback device in the same OSD display.

As an extension to that enhancement, it would be very interesting to build custom device pairings that can be selected in the OSD.

Just riffing on the implementation here...

1. First the user would create pairings (recording + playback device) via dropdown select grid:

• Front Microphone Jack + Front Speaker Jack
• Front Microphone Jack + Monitor Speaker (HDMI)
• USB Camera Microphone + Monitor Speaker (HDMI)
• USB Camera Microphone + Front Speaker Jack

2. Then from the OSD, the pairing of the device currently connected would be listed

• ex: If USB Camera is not connected, the pairings that include the USB Camera Microphone will not be displayed.
• When set, the device CustomName would be used for clarity.

3. When the user selects a pairing entry, both system Recording and Playback device settings are set accordingly.