New style & gfx for master vol/pitch sliders, fx front panel artwork
Effect panel & effect window style, new knob images, knobs use palette
Oops! Missing parenthesis in knob.cpp :P
Layout & bg artwork for peak controller, matching bg artwork for lfo controller & bass booster
Slight colour tweak!
Merge pull request #76 from diizy/stable-0.4

Another UI branch merge...?