FE/Qt: Rest of the icons update (color format fix).
FE/Qt: General Icon Update: USB/Serial/Parallel port icons.
FE/Qt4: small updates to some icons
renamed VirtualBox4 to VirtualBox
purge the obsolete Qt3 GUI
FE/Qt: Major icon refine, part 1.
FE/Qt: Replaced all semi-transparent (disabled-like) icons with grey-scaled variants for a better visual difference to normal (non-disabled) icons.
FE/Qt: Refreshed lots of icons (various cosmetic fixes).
export to OSE again
removed from OSD (temporarily)
import