Fix various typos [skip ci]

Fixed 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/Base/FileInfo.h

@@ -48,7 +48,7 @@ public:
         ReadWrite = 0x03,
     };
 
-    /// Constrction
+    /// Construction
     FileInfo (const char* _FileName="");
     FileInfo (const std::string &_FileName);
     /// Set a new file name

src/Base/Persistence.h

@@ -101,7 +101,7 @@ public:
      *    writer << writer.ind() << "<Mesh file=\"" << writer.addFile("MeshKernel.bms", this) << "\"/>" << std::endl;
      * }
      * \endcode
-     * The writer.isForceXML() is an indication to force you to write XML. Regardless of size and effectivness.
+     * The writer.isForceXML() is an indication to force you to write XML. Regardless of size and effectiveness.
      * The second part informs the Base::writer through writer.addFile("MeshKernel.bms", this) that this object
      * wants to write a file with the given name. The method addFile() returns a unique name that then is written
      * in the XML stream.

src/Base/PyExport.h

@@ -168,22 +168,22 @@ public:
         return *this;
     }
 
-    /// derefrence operators
+    /// dereference operators
     HandledType &operator*() {
         return *_pHandels;
     }
 
-    /// derefrence operators
+    /// dereference operators
     HandledType *operator->() {
         return _pHandels;
     }
 
-    /// derefrence operators
+    /// dereference operators
     const HandledType &operator*() const {
         return _pHandels;
     }
 
-    /// derefrence operators
+    /// dereference operators
     const HandledType *operator->() const {
         return _pHandels;
     }