jw.build.cmds: Move build.cmds -> cmds.projects

Reorganize the Python module structure. Placing the command classes
under jw.cmds.projects instead of jw.build.cmds will allow to add a
nested command structure, with the current commands, being mostly
related to building software, found below a "projects" toplevel
command.

Other conceivable commands could be "package" for packaging, or
"distro" for commands wrapping the distribution's package manager.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/Cmd.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+from argparse import ArgumentParser
+
+from ..lib.Cmd import Cmd as Base
+from ..lib.Types import LoadTypes
+
+class Cmd(Base): # export
+
+    def __init__(self, name: str, help: str) -> None:
+        super().__init__(name, help)
+
+    def _add_subcommands(self) -> None:
+        self.add_subcommands(
+            LoadTypes(
+                [__name__.rsplit('.', 1)[0] + '.' + self.name],
+                type_name_filter=r'Cmd[^.]'
+            )
+        )
+
+    async def run(self, args):
+        return self._run(args)