Class Management
| GB_CLASS | The Gambas class datatype. | 
| GB.GetClass | Returns the class of a specified object. | 
| GB.GetClassName | Returns the class name of a specified object. | 
| GB.ExistClass | Returns if a specified class exists. | 
| GB.FindClass | Finds a class from its name. | 
| GB.Is | Returns if an object is a member of a specified class, of one
of its descendant. | 
Overview
These functions allows you to manage classes identifiers, and
to retrieve a class identifier from its name.