display: Move klippy/extras/display.py to klippy/extras/display/display.py

Move the display code into its own directory.  This is in preparation
for splitting it up into its own modules.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/display/__init__.py

@@ -0,0 +1,9 @@
+# Package definition for the extras/display directory
+#
+# Copyright (C) 2018  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+import display
+
+def load_config(config):
+    return display.load_config(config)