Remove magic number and hard type enums in DrawBrokenView.h

- Remove currently present magic numbers
- Hard type enums, so magic numbers can no longer be introduced. We don't want people to introduce magic numbers.

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -1043,7 +1043,7 @@ void QGIViewPart::drawBreakLines()
         return;
     }
 
-    auto breakType = vp->BreakLineType.getValue();
+    DrawBrokenView::BreakType breakType = static_cast<DrawBrokenView::BreakType>(vp->BreakLineType.getValue());
     auto breaks = dbv->Breaks.getValues();
     for (auto& breakObj : breaks) {
         QGIBreakLine* breakLine = new QGIBreakLine();