Fix bug that produces a suddent crossfader jump ..
when using auto dj and you have moved the crossfader manually.
The fix is a kind of softtacover for the crossfader from auto DJ.
Merge pull request #290 from daschuer/autodj_manual_fix

Fix bug that produces a suddent crossfader jump ..
Added Nino MP to the contributor list, for his addition of a RGB waveform.
Thank you verry much.