Fem: [skip ci] Fix several clazy issues:

* Maybe you meant to call base method instead [-Wclazy-skipped-base-method]
* Using copy-ctor but class SbMatrix has a trivial copy-ctor but non trivial assign operator [-Wclazy-rule-of-two-soft]
* Missing emit keyword on signal call FemGui::PointMarker::PointsChanged [-Wclazy-incorrect-emit]

src/Mod/Fem/Gui/ViewProviderFemConstraintFixed.cpp

@@ -104,7 +104,7 @@ bool ViewProviderFemConstraintFixed::setEdit(int ModNum)
 
         return true;
     } else {
-        return ViewProviderDocumentObject::setEdit(ModNum);
+        return ViewProviderDocumentObject::setEdit(ModNum); // clazy:exclude=skipped-base-method
     }
 }