VuMeter bar to use full widget size

Check widget size to know bar size instead of checking bitmap size to allow resizable VuMeters
Update wvumeter.cpp
Strange, but fixes horizontal VuMeter peak

Horizontal VuMeter peaks was not visible before at all.
Fix identation and typo
Fix identation again
Last attemp of identation fixing
Update wvumeter.cpp
Merge remote-tracking branch 'mixxxdj/pr/350'
Updates to WVuMeter to use target/source rects.
Use PerformanceTimer instead of QTime in WVUMeter::onConnectedControlChanged.

Base:
Stat("WVuMeter::onConnectedControlChanged","count=2606,sum=1.08114e+07ns,average=4148.66ns,min=1115ns,max=47684ns,variance=1.17059e+07ns^2,stddev=3421.38ns")
Experiment:
Stat("WVuMeter::onConnectedControlChanged","count=3008,sum=1.92368e+06ns,average=639.522ns,min=159ns,max=24937ns,variance=584952ns^2,stddev=764.821ns")