moved instatiation of cuecontrol and clockcontrol to enginebuffer
removed not working m_pPlayButton connection
fixed play latching during cue preview, fixes Bug #1216433
fix waveform on kill buttons change
Merge pull request #70 from leo-combes/waveform_fix

fix waveform on kill buttons change, fixes https://bugs.launchpad.net/mixxx/+bug/1178813
Added Leo Combes to contributor list. Thank you!
Merge branch 'master' into recording_improvements