framework: remove use of nested-name-specifier tinyxml::
framework: remove use of nested-name-specifier tinyxml::

There is no 'tinyxml' namespace in the actual tinyxml library (i.e. not
the one in extlibs/). Thus using tinyxml:: in MeshVTK would result in
compilation errors.


Former-commit-id: 01cd816c2bbdf1cf809e4f0026fbea9714de5abc
Anatoscope/sofa,Anatoscope/sofa,hdeling/sofa,hdeling/sofa,FabienPean/sofa,Anatoscope/sofa,hdeling/sofa,hdeling/sofa,FabienPean/sofa,Anatoscope/sofa,FabienPean/sofa,FabienPean/sofa,Anatoscope/sofa,Anatoscope/sofa,hdeling/sofa,hdeling/sofa,FabienPean/sofa,Anatoscope/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,Anatoscope/sofa,FabienPean/sofa,FabienPean/sofa,hdeling/sofa,hdeling/sofa,hdeling/sofa,hdeling/sofa,Anatoscope/sofa