4.0

• Added support for layer effects (filters, GEGL operations). These can be called via the pdb object. For example, the gegl:gaussian-blur effect can be called as pdb.gegl__gaussian_blur(layer, std_dev_x=5.0, std_dev_y=5.0).
• Procedures can now only be called with keyword arguments (i.e. it is no longer possible to call procedures with positional arguments). This change is meant to encourage plug-in developers to make the client code more readable. The only positional argument allowed is a Gimp.Layer instance for layer effects.
• Updated the script and the generated stubs according to changes in GIMP 3.0.0-RC2.
• The procedure module now automatically initializes the Gegl module by invoking Gegl.init() before the start of a procedure.
• The generated stub file pypdb.pyi now also contains private attributes from the _PyPDB class, PDBProcedure class and all its subclasses. This avoids IDE warnings related to unrecognized attributes.