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/CmdCflags.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+
+from argparse import Namespace, ArgumentParser
+
+from ..Cmd import Cmd
+
+class CmdCflags(Cmd): # export
+
+    def __init__(self) -> None:
+        super().__init__('cflags', help='cflags')
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)
+        parser.add_argument('module', nargs='*', help='Modules')
+
+    def _run(self, args: Namespace) -> None:
+        deps = self.app.get_modules_from_project_txt(args.module, ['pkg.requires.jw'], 'build',
+                scope = 2, add_self=True, names_only=True)
+        r = ''
+        for m in reversed(deps):
+            try:
+                pd = self.app.proj_dir(m)
+                if pd is None:
+                    continue
+                r = r + ' -I' + pd + '/include'
+            except Exception as e:
+                self.app.warn(f'No include path for module "{m}", ignoring: {e}')
+        print(r[1:])