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/App/AppTechDrawPy.cpp

@@ -119,7 +119,7 @@ void copy(Py::Dict sourceRange, OutputIt targetIt)
   string key;
   string value;
 
-  for (auto keyPy : sourceRange.keys()) {
+  for (const auto& keyPy : sourceRange.keys()) {
     key = Py::String(keyPy);
     value = Py::String(sourceRange[keyPy]);
     *targetIt = {key, value};