various changes

[borco]

• use uv to manage the package
  • the version is now managed in the pyproject.toml
  • removed the various publishing files (uv publish should work, but I haven't tested it...)
• changed the folder names to better match python conventions
  • package name changed to socket_singleton (from Socket_Singleton)
  • class name changed to SocketSingleton (from Socket_Singleton)
• use pytest to drive the tests
  • moved the tests to tests subdir
• added some typing info
• added a trace_no_args: bool = False option to SocketSingleton.__init__
  • if False (the default), the class behaves as before
  • if True, the trace callbacks will be called even if the client doesn't send any args
  • I'm using the SocketSingleton with a GUI app - if an app instance is already running, I want to be able to detect if the user tries to launch it again, so that I can bring the existing instance in focus

[borco]

If you like the changes, you might want to increase the version to 3.0.0, as the API slightly changes from:

from Socket_Singleton import Socket_Singleton

to

from socket_singleton import SocketSingleton