GitLab

bugfixes and some refactoring. Now editing subobjects is working, but the navigation buttons bar remains to do.

 * new: if field is null, a button allow to instanciate it with type declared or given via Meta-inf services
 * example added in demo, works for the File attribute, but not yet for the list, because the tree isn't updated

 * simple field are not displayed in the tree
 * begin of implementation for applying modification

 * some bugfixes in tree

 * better size settings attempt