cmds.CmdPkg: Rename pkg -> packages

Relabel the toplevel command CmdPkg from "pkg" to "packages", because it rolls off the tounge much more nicely. Keep "pkg" as an alias for compatibilty.
Signed-off-by: Jan Lindemann <jan@janware.com>

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

@@ -10,7 +10,12 @@ if TYPE_CHECKING:
 class CmdPkg(Cmd):  # export
 
     def __init__(self, parent: Parent) -> None:
-        super().__init__(parent, 'pkg', help = 'System package manager wrapper')
+        super().__init__(
+            parent,
+            'packages',
+            aliases = ['pkg'],
+            help = 'System package manager wrapper'
+        )
         self.load_subcommands()
 
     async def _run(self, args):