Added supports_input/output methods to DeviceTrait #920
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Only WASAPI overrides the default method implementations, other hosts work the same as before (iterating over configs) but they can potentially be optimized later.
Time to get list of WASAPI devices on my machine (5 devices in total) before change:
Input devices: 12 ms, output devices: 187 ms
After change:
Input devices: 1 ms, output devices: 1 ms
This fixes issue #867