Port away from kdebug to qcdebug
The approach taken is a bit different from what's in the porting scripts or in pigment: I've moved kis_debug to libglobal and adapted the dbgKrita etc. defines to use qcDebug etc. I've kept the old category numbers for now. I've also ported all places where we used kDebug() etc. directly, and not a few places where qDebug() etc were used directly.
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