Latenight-Stacked: Differentiate colors of decks 3 and 4.

I've had enough moments of confusion about which deck was 1 and
which was 3 that having some color might help.
waveform beats always thin
Merge pull request #309 from demos/waveform_precise_beats

waveform beats always thin
Remove m_type guard from ControlEffectKnob
This causes not seeting the desired ControlHints correctly
introduces a setBehaviour() function to set all Behaviour parameters in one call
Merge branch 'master' of git://github.com/mixxxdj/mixxx into avoid_waveform_jitter