[OpenWalnut-Dev] Change WColor as osg::Vec4 typedef

[Mathias Goldau]

As we discussed this several times, I will focus on that task (replace our
WColor with osg::Vec4) during my journey to cologne and back again...

So I recommend, if you don't merge your code base/branches regularly, update
your branches now, so you will not have a totally merge mess.

regards
math

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