Add column for xruns and add a button to manually clear the buffers

[dagargo]

Ideally the button should not be needed but it might be a good idea to have it just in case.

[dagargo]

As xruns are ignored now and everything self adjusts properly, this is very likely not needed.

[dagargo]

This is not needed anymore.

[dagargo]

There is not way to ignore the xruns safely because it's the way to be notified of errors in the audio flow.

Sometimes, an xrun won't affect the resampler ratio but sometimes it will and drastic audio artifact will appear.

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After some recent improvements and fixes, the timing and ratio are much tighter now and the issues regarding ratio adjustments are not happening in my tests.

I'm leaving this open in case this needs to be reconsidered in some scenarios.