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/projects/CmdCommands.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+
+from argparse import Namespace, ArgumentParser
+
+from ..Cmd import Cmd
+
+class CmdCommands(Cmd): # export
+
+    def __init__(self) -> None:
+        super().__init__('commands', help='List available commands')
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)
+
+    def _run(self, args: Namespace) -> None:
+        import sys, re, os, glob
+        this_dir = os.path.dirname(sys.modules[__name__].__file__)
+        ret = []
+        for file_name in glob.glob('Cmd*.py', root_dir=this_dir):
+            cc_name = re.sub(r'^Cmd|\.py', '', file_name)
+            name = re.sub(r'(?<!^)(?=[A-Z])', '-', cc_name).lower()
+            ret.append(name)
+        print(' '.join(ret))