fix: #34

tweak(#34): allow to display in export column from linked entity

fix: bc break for treebuilder

Merge pull request #31 from DylanKas/feature/Extension-trait

feat: Moving controller code in trait

tweak(Export): update config pass and add new templates to override

tweak(doc): add migration doc

tweak(doc): update doc to match EasyAdmin 1.x

feat(User): add __toString method