Maybe Unitialized Warning

[Taose]

Couple of issues with xvector, not least because whoever coded this thinks "shortening" variable names into stuff that can't be explained is useful. This code needs to be de-mystified and that's going to take a bit of understanding.

engine/src/gfx/xvector.h:246:22: warning: ‘localDir.QVector::<anonymous>.QVector::<anonymous union>::k’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     r.j = a.k*b.i-a.i*b.k;
                   ~~~^~~~