Rebase on master, hide some other subcommands

The list of hidden subcommands were approved by @skullydazed ;)
Currently hidden if 'user.developer' is not True:

  - cformat
  - docs
  - kle2json
  - pyformat
  - pytest

lib/python/qmk/cli/docs.py

@@ -0,0 +1,25 @@
+"""Serve QMK documentation locally
+"""
+import http.server
+import os
+
+from milc import cli
+
+
+@cli.argument('-p', '--port', default=8936, type=int, help='Port number to use.')
+@cli.subcommand('Run a local webserver for QMK documentation.', hidden=True)
+def docs(cli):
+    """Spin up a local HTTPServer instance for the QMK docs.
+    """
+    os.chdir('docs')
+
+    with http.server.HTTPServer(('', cli.config.docs.port), http.server.SimpleHTTPRequestHandler) as httpd:
+        cli.log.info("Serving QMK docs at http://localhost:%d/", cli.config.docs.port)
+        cli.log.info("Press Control+C to exit.")
+
+        try:
+            httpd.serve_forever()
+        except KeyboardInterrupt:
+            cli.log.info("Stopping HTTP server...")
+        finally:
+            httpd.shutdown()