TD: [skip ci] Fix several clazy issues:

* Using copy-ctor but class TechDraw::anglePoints has a trivial copy-ctor but non trivial assign operator [-Wclazy-rule-of-two-soft]
* Using copy-ctor but class TechDraw::arcPoints has a trivial copy-ctor but non trivial assign operator [-Wclazy-rule-of-two-soft]
* Missing reference in range-for with non trivial type [-Wclazy-range-loop-reference]
* C++11 range-loop might detach Qt container (QList) [-Wclazy-range-loop-detach]
* signal arguments need to be fully-qualified (TechDrawGui::QGIView instead of QGIView) [-Wclazy-fully-qualified-moc-types]
* Use multi-arg instead [-Wclazy-qstring-arg]
* Use midRef() instead [-Wclazy-qstring-ref]

src/Mod/TechDraw/Gui/Grabber3d.cpp

@@ -179,7 +179,6 @@ double Grabber3d::copyActiveViewToSvgFile(App::Document* appDoc,
         Base::Console().Error("G3D::copyActiveViewToSvgFile - can not open file - %s/n", fileSpec.c_str());
         return result;
     }
-    QColor dbColor(Qt::blue);
     execVectorizeAction(viewerSvg,
                         va.get(),
                         outWidth, outHeight,