Log message:
python/wheel.mk: simplify a lot, and switch to 'installer' for installation

This follows the recommended bootstrap method (flit_core, build, installer).

However, installer installs different files than pip, so update PLISTs
for all packages using wheel.mk and bump their PKGREVISIONs.

Log message:
py-confuse: updated to 2.0.1

v2.0.1
- Remove a `<4` Python version requirement bound.

v2.0.0
- Drop support for versions of Python below 3.6.

v1.7.0
- Add support for reading configuration values from environment variables
  (see `EnvSource`).
- Resolve a possible race condition when creating configuration directories.

Log message:
*: bump PKGREVISION for egg.mk users

They now have a tool dependency on py-setuptools instead of a DEPENDS

Log message:
py-confuse: fix MASTER_SITES

Log message:
New package, py-confuse. Part of PR pkg/56378.

Confuse is a configuration library for Python that uses YAML. It takes
care of defaults, overrides, type checking, command-line integration,
human-readable errors, and standard OS-specific locations.

Here's what Confuse brings to the table:

-  An utterly sensible API resembling dictionary-and-list structures
   but providing transparent validation without lots of boilerplate
   code.
-  Combine configuration data from multiple sources. Using
   layering, Confuse allows user-specific configuration to seamlessly
   override system-wide configuration, which in turn overrides built-in
   defaults.
-  Look for configuration files in platform-specific paths.
-  Integration with command-line arguments via argparse or optparse
   from the standard library.