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/mrichtextedit.cpp

@@ -201,7 +201,8 @@ MRichTextEdit::MRichTextEdit(QWidget *parent, QString textIn) : QWidget(parent)
     // font size
 
     QFontDatabase db;
-    for(int size: db.standardSizes()) {
+    const auto sizes = db.standardSizes();
+    for(int size: sizes) {
         f_fontsize->addItem(QString::number(size));
     }
     //TODO: void QComboBox::setEditText(const QString &text) to " " when multiple select