AE: add AE setting for nuc

Some nucs and AVRs have a problem when refreshrate is larger than 30 hz on 1080p and sampleRate is below 48 khz.

As a workaround those users could add

```
<advancedsettings>
  <audio>
    <minimumsamplerate>48000</minimumsamplerate>
  </audio>
</advancedsettings>
```

will take care of this. As it is only relevant for some users I won't implement an extra setting in the gui.