Massive overhaul of "generate project" feature

previous incarnation was woefully lacking.  new feature is much more
extensible.  still need to remove old POS integration specifics in
some places.

and a couple of unrelated things that snuck in..

- deprecate `rattail.util.OrderedDict`
- deprecate `rattail.util.import_module_path()`
- deprecate `rattail.util.import_reload()`

tailbone/views/purchasing/receiving.py

@@ -28,6 +28,7 @@ import os
 import re
 import decimal
 import logging
+from collections import OrderedDict
 
 import humanize
 import sqlalchemy as sa
@@ -35,7 +36,7 @@ import sqlalchemy as sa
 from rattail import pod
 from rattail.db import model, Session as RattailSession
 from rattail.time import localtime, make_utc
-from rattail.util import pretty_quantity, prettify, OrderedDict, simple_error
+from rattail.util import pretty_quantity, prettify, simple_error
 from rattail.threads import Thread
 
 import colander