Revert "Git initialisation first classes not finished"

This reverts commit 7c30b2b8a2aa0809a304ba3e44bdeb2c8447fb55.
Merge branch 'develop' of https://github.com/H4412/GL into develop
Merge branch 'master' of https://github.com/H4412/GL into develop
Merge branch 'develop' of https://github.com/H4412/GL into develop
corrected data model (linking errors)
Compiling
Merge branch 'develop' of https://github.com/H4412/GL into feature/tree_transformation

Conflicts:
	ProcesseurXML/Model/Element.h