[core] Re-enable preliminary module loading (stubbed)

Add logic for parsing commandline options, and a preliminary stub for
loading modules.

Note: The idea is that core.module.load() will return a valid, but
empty, module that displays an error, if the module cannot be loaded

core/config.py

@@ -0,0 +1,15 @@
+import argparse
+
+MODULE_HELP = "Specify a space-separated list of modules to load. The order of the list determines their order in the i3bar (from left to right). Use <module>:<alias> to provide an alias in case you want to load the same module multiple times, but specify different parameters."
+
+class Config(object):
+    def __init__(self, args):
+        parser = argparse.ArgumentParser(description='bumblebee-status is a modular, theme-able status line generator for the i3 window manager. https://github.com/tobi-wan-kenobi/bumblebee-status/wiki')
+        parser.add_argument("-m", "--modules", nargs="+", action='append', default=[],
+            help=MODULE_HELP)
+        self._args = parser.parse_args(args)
+
+    def modules(self):
+        return [item for sub in self._args.modules for item in sub]
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

core/module.py

@@ -0,0 +1,9 @@
+
+def load(module_name):
+    pass
+
+class Module(object):
+    def update(self):
+        pass
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4