MeshPart: [skip ci] Fix several clazy issues:

* Missing reference in range-for with non trivial type [-Wclazy-range-loop-reference]
* Use multi-arg instead [-Wclazy-qstring-arg]

src/Mod/MeshPart/App/AppMeshPartPy.cpp

@@ -272,7 +272,7 @@ private:
             proj.projectToMesh(shape, maxDist, polylines);
 
             Py::List list;
-            for (auto it : polylines) {
+            for (const auto& it : polylines) {
                 Py::List poly;
                 for (auto jt : it.points) {
                     Py::Vector v(jt);
@@ -304,7 +304,7 @@ private:
             std::vector<MeshProjection::PolyLine> polylines;
             proj.projectParallelToMesh(shape, dir, polylines);
             Py::List list;
-            for (auto it : polylines) {
+            for (const auto& it : polylines) {
                 Py::List poly;
                 for (auto jt : it.points) {
                     Py::Vector v(jt);
@@ -354,7 +354,7 @@ private:
             proj.projectParallelToMesh(polylinesIn, dir, polylines);
 
             Py::List list;
-            for (auto it : polylines) {
+            for (const auto& it : polylines) {
                 Py::List poly;
                 for (auto jt : it.points) {
                     Py::Vector v(jt);

src/Mod/MeshPart/App/CurveProjector.cpp

@@ -785,7 +785,7 @@ void MeshProjection::findSectionParameters(const TopoDS_Edge& edge, const Base::
     const MeshCore::MeshPointArray& points = _rcMesh.GetPoints();
 
     Base::Vector3f res;
-    for (auto it : facets) {
+    for (const auto& it : facets) {
         for (int i=0; i<3; i++) {
             Base::Vector3f pt1 = points[it._aulPoints[i]];
             Base::Vector3f pt2 = points[it._aulPoints[(i+1)%3]];
@@ -860,7 +860,7 @@ void MeshProjection::projectOnMesh(const std::vector<Base::Vector3f>& pointsIn,
 
     const MeshCore::MeshFacetArray& facets = _rcMesh.GetFacets();
     const MeshCore::MeshPointArray& points = _rcMesh.GetPoints();
-    for (auto it : facets) {
+    for (const auto& it : facets) {
         for (int i=0; i<3; i++) {
             if (!it.HasNeighbour(i)) {
                 boundaryPoints.push_back(points[it._aulPoints[i]]);
@@ -985,7 +985,7 @@ void MeshProjection::projectParallelToMesh (const std::vector<PolyLine> &aEdges,
 
     Base::SequencerLauncher seq( "Project curve on mesh", aEdges.size() );
 
-    for (auto it : aEdges) {
+    for (const auto& it : aEdges) {
         std::vector<Base::Vector3f> points = it.points;
 
         typedef std::pair<Base::Vector3f, MeshCore::FacetIndex> HitPoint;

src/Mod/MeshPart/App/Mesher.cpp

@@ -177,7 +177,7 @@ public:
 
         MeshCore::MeshFacetArray faces;
         std::size_t numTriangles = 0;
-        for (auto it : domains)
+        for (const auto& it : domains)
             numTriangles += it.facets.size();
         faces.reserve(numTriangles);
 
@@ -265,7 +265,7 @@ public:
 
         MeshCore::MeshPointArray verts;
         verts.resize(vertices.size());
-        for (auto it : vertices)
+        for (const auto& it : vertices)
             verts[it.i] = it.toPoint();
 
         MeshCore::MeshKernel kernel;
@@ -275,7 +275,7 @@ public:
         meshdata->swap(kernel);
         if (createSegm) {
             int index = 0;
-            for (auto it : colorMap) {
+            for (const auto& it : colorMap) {
                 Mesh::Segment segm(meshdata, false);
                 for (auto jt : it.second) {
                     segm.addIndices(meshSegments[jt]);
@@ -291,7 +291,7 @@ public:
             }
         }
         else {
-            for (auto it : meshSegments) {
+            for (const auto& it : meshSegments) {
                 meshdata->addSegment(it);
             }
         }

src/Mod/MeshPart/Gui/Command.cpp

@@ -229,8 +229,8 @@ void CmdMeshPartSection::activated(int)
         std::vector<Mesh::MeshObject::TPolylines> polylines;
         mesh->crossSections(sections, polylines);
 
-        for (auto it2 : polylines) {
-            for (auto it3 : it2) {
+        for (const auto& it2 : polylines) {
+            for (const auto& it3 : it2) {
                 Py::Tuple arg(1);
                 Py::List list;
                 for (auto it4 : it3) {

src/Mod/MeshPart/Gui/Tessellation.cpp

@@ -307,11 +307,11 @@ void Tessellation::process(int method, App::Document* doc, const std::list<App::
                 "__mesh__.Mesh=MeshPart.meshFromShape(%4)\n"
                 "__mesh__.Label=\"%5 (Meshed)\"\n"
                 "del __doc__, __mesh__, __part__, __shape__\n")
-                .arg(this->document)
-                .arg(objname)
-                .arg(subname)
-                .arg(param)
-                .arg(label);
+                .arg(this->document,
+                     objname,
+                     subname,
+                     param,
+                     label);
 
             Gui::Command::runCommand(Gui::Command::Doc, cmd.toUtf8());