Tempo synced Delay Plugin

I have been working on a native delay plugin. It makes use of the TempoSycnKnob for both the delay time, and the lfo time.

first pull request ever !!! please let me know if I have done anything  wrong..
this phase overflow check would be better moved to setFrequency (after you move the setFrequency call outside the frameloop), no need to do it every frame