* Rename all Constraint by [name]Constraint3D
* Create Refs and Libraries for Constraint2D
* Remove ref to PhysWorld in Constraints ctors
* Update Constraint2d ctor to have RigiBodies first
* Add New static function for all constraints and fix an oopsie
* Add Contraint Library and remove all library useless aliases
* Add ConstraintComponent2D
* remove useless definition of Constraint2D library
* Fix : getting the world of the constraint before having created it
* Make the GetStaticBody function return a ref
* Remove : Useless AddJoint Fonction and Update CreateJoint function
* Update PhysicsSystem3D because GetStaticBody return now a ref
* Oops
* Having done something with the 3D and i was needing 2D
* Add ConstraintComponent as friend of Collision and PhysicsComponent
* Update all the Get[Static/Rigid]Body function so they return a pointer
* fix the bugs caused by the commit before
* update : CreateConstraint lambda for the nullptr case
* remove the useless use of const pointer
* Update : CreateConstraint function
* Update ChangeLog.md
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