REN-132 begin major refactoring (does not compile yet)
REN-132 Further refactoring (does not build yet)
REN-132 Further refactoring
REN-132 Implemented new parser base
REN-132 Bugfixes and Polygon sharing
REN 132 Fixed bugs, implemented coordinate transformation, refactoring

- Removed vrml application (no longer works and is not needed)
- Polygons no longer calculate normal arrays
- Removed libxml2 parser
REN-132 Fixed bugs implemented some features

- disable optimization (duplicate vertex removal) by default
- fixes transformation bugs (e.g. shared geometry must not be transformed)
- support address elements
- allow shared geometry to be referenced in the xml document before it
  is defined
REN-132 removed unused include breaking the build