Fix typos and misc. formatting [skip ci]

Found via `codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,ba,beginn,behaviour,bloaded,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childs,colour,colours,commen,currenty,dof,doubleclick,dum,eiter,elemente,feld,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,orgin,orginx,orginy,ot,pard,pres,programm,que,recurrance,rougly,seperator,serie,sinc,strack,substraction,te,thist,thru,tread,uint,unter,vertexes,wallthickness,whitespaces -S ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml`

src/Mod/Mesh/App/Core/Algorithm.cpp

@@ -599,7 +599,7 @@ void MeshAlgorithm::SplitBoundaryLoops( std::list<std::vector<unsigned long> >&
         it != aBorders.end(); ++it) {
         bool split=false;
         for (std::vector<unsigned long>::iterator jt = it->begin(); jt != it->end(); ++jt) {
-            // two (ore more) boundaries meet in one non-manifold point
+            // two (or more) boundaries meet in one non-manifold point
             if (openPointDegree[*jt] > 2) {
                 split = true;
                 break;

src/Mod/Mesh/App/Core/SetOperations.h

@@ -163,7 +163,7 @@ private:
   std::set<MeshPoint>       _cutPoints;
   /** all edges */
   std::map<Edge, EdgeInfo>  _edges;
-  /** map from facet index to his cutted points (mesh 1 and mesh 2) Key: Facet-Index  Value: List of iterators of set<MeshPoint> */
+  /** map from facet index to its cut points (mesh 1 and mesh 2) Key: Facet-Index  Value: List of iterators of set<MeshPoint> */
   std::map<unsigned long, std::list<std::set<MeshPoint>::iterator> > _facet2points[2];
   /** Facets collected from region growing */
   std::vector<MeshGeomFacet> _facetsOf[2];
@@ -172,7 +172,7 @@ private:
 
   /** Cut mesh 1 with mesh 2 */
   void Cut (std::set<unsigned long>& facetsNotCuttingEdge0, std::set<unsigned long>& facetsCuttingEdge1);
-  /** Trianglute each facets cutted with his cutting points */
+  /** Trianglute each facets cut with its cutting points */
   void TriangulateMesh (const MeshKernel &cutMesh, int side);
   /** search facets for adding (with region growing) */
   void CollectFacets (int side, float mult);

src/Mod/Mesh/Gui/ViewProviderTransformDemolding.cpp

@@ -200,7 +200,7 @@ void ViewProviderMeshTransformDemolding::valueChangedCallback(void)
   temp.setTransform( SbVec3f(0,0,0),    // no transformation
                      rot,               // rotation from the dragger
                      SbVec3f(1,1,1),    // no scaling
-                     SbRotation() ,     // no scaling oriantation
+                     SbRotation() ,     // no scaling orientation
                      SbVec3f(center.x,center.y,center.z)); // center of rotation
   pcTransformDrag->setMatrix( temp );
 }