conan-io/conan ? reverse-engineered prompt

Build me a Python command line tool for managing C and C++ packages, something like Conan. I want developers to be able to define recipes, install dependencies, and create, upload, and download binaries for different platforms and build setups. It should work on Linux, macOS, and Windows, and support common workflows like CMake, Makefiles, Meson, and other build systems without forcing one specific setup.

Make it feel practical for real projects, with clear help output, sensible defaults, and support for working with private package servers as well as decentralized use. It should handle cross compiling and different binary configurations cleanly, and be flexible enough to extend with Python based recipes and plugins. Please include a solid test suite and keep the code organized so it can be run from source and installed in editable mode. If you need current docs or compatibility details, look them up online first.