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/DrawGuiUtil.cpp

@@ -128,7 +128,6 @@ TechDraw::DrawPage* DrawGuiUtil::findPage(Gui::Command* cmd)
             Gui::MDIView* mv = w->activeWindow();
             MDIViewPage* mvp = dynamic_cast<MDIViewPage*>(mv);
             if (mvp) {
-                QString windowTitle = mvp->windowTitle();
                 QGSPage* qp = mvp->getQGSPage();
                 page = qp->getDrawPage();
             }