Minor fixes for current CG_WebExamples

Finally found a little bit of time, to work on this project:
- Point and Vector support Z coordinate
- Architecture for Point and Vector are now a little bit more structured
(something like in C++, separate variables and methods)
- All HTML files are now updated (but they originally contain some minor
bugs)

TODO (Tomorrow):
- Vector will have to support all needed functions for further work
(add, sub, neg, cross, dot …)
- Will add Matrix, Camera scripts ... possibly Projection to …. It
depends ….