Setuptools warnings: Package 'klaus.static' is absent from the packages configuration.

[sbraz]

Hi,
I noticed that recent versions of setuptools show this warning:

/usr/lib/python3.11/site-packages/setuptools/command/build_py.py:201: _Warning: Package 'klaus.static' is absent from the `packages` configuration.                                                                
!!                                                                                                                                                                                                                 
                                                                                                                                                                                                                   
        ********************************************************************************                                                                                                                           
        ############################                                                                                                                                                                               
        # Package would be ignored #                                                                                                                                                                               
        ############################                                                                                                                                                                               
        Python recognizes 'klaus.static' as an importable package[^1],                                                                                                                                             
        but it is absent from setuptools' `packages` configuration.                                                                                                                                                
                                                                                                                                                                                                                   
        This leads to an ambiguous overall configuration. If you want to distribute this                                                                                                                           
        package, please make sure that 'klaus.static' is explicitly added                                                                                                                                          
        to the `packages` configuration field.                                                                                                                                                                     
                                                                                                                                                                                                                   
        Alternatively, you can also rely on setuptools' discovery methods                                
        (for example by using `find_namespace_packages(...)`/`find_namespace:`                                                                                                                                     
        instead of `find_packages(...)`/`find:`).                                                                                                                                                                  
                                                                                                                                                                                                                   
        You can read more about "package discovery" on setuptools documentation page:                                                                                                                              
                                                                                                                                                                                                                   
        - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html                                                                                                                                    
                                                                                                                                                                                                                   
        If you don't want 'klaus.static' to be distributed and are                                                                                                                                                 
        already explicitly excluding 'klaus.static' via                                                  
        `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,                      
        you can try to use `exclude_package_data`, or `include-package-data=False` in 
        combination with a more fine grained `package-data` configuration.                                                                                                                                         
                                                                                                                                                                                                                   
        You can read more about "package data files" on setuptools documentation page:                                                                                                                             
                                                                                                                                                                                                                   
        - https://setuptools.pypa.io/en/latest/userguide/datafiles.html                                                                                                                                            
                                                                                                         
                                                                                                         
        [^1]: For Python, any directory (with suitable naming) can be imported,                          
              even if it does not contain any `.py` files.                                    
              On the other hand, currently there is no concept of package data                           
              directory, all directories are treated like packages.                                      
        ********************************************************************************                 
                                                                                                         
!!                                                                                                       

And a similar message for klaus.templates.

[jonashaag]

I think it's time to switch to a pyproject.toml only configuration