+ Added a global coordinate system mode for angles.
+ Added a cylindrical coordinates definition (with an optional height in angle widget)
+ Did some refactoring
Doc and translations to be done soon
First part.
Some pieces of code placed in the GUI will have to be moved to the engine side but it has to be coordinated with issue 21392 (EDF 1631 GEOM: Dump study of sketcher 3D with relatives coordinates )