Fix various typos

Found via `codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,apoints,ba,beginn,behaviour,bloaded,bottome,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childrens,childs,colour,colours,commen,connexion,currenty,dof,doubleclick,dum,eiter,elemente,ende,feld,finde,findf,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,inout,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oce,oder,ontop,orgin,orginx,orginy,ot,pard,parm,parms,pres,programm,que,rady,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,./build/doc/SourceDocu`

src/Mod/Assembly/App/opendcm/core/property.hpp

@@ -74,7 +74,7 @@ namespace dcm {
  * A property of kind @ref vertex_property will added to vertices, a property of kind @ref object_property to all
  * objects and so on.
  *
- * If the property type is a standart c++ type like int or bool, the defualt value can't be set by using its
+ * If the property type is a standart c++ type like int or bool, the default value can't be set by using its
  * constructor. Therefore a interface for setting default values is added to the property. If you want
  * to assign a default value you just need to add a struct default_value which returns the wanted default
  * value with the operator(). If you don't want a default value, just don't add the struct. The implementation