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/templates/forms/deform_buefy.mako

@@ -11,10 +11,23 @@
   <section>
     % if form_body is not Undefined and form_body:
         ${form_body|n}
+    % elif form.grouping:
+        % for group in form.grouping:
+            <nav class="panel">
+              <p class="panel-heading">${group}</p>
+              <div class="panel-block">
+                <div>
+                  % for field in form.grouping[group]:
+                      ${form.render_buefy_field(field)}
+                  % endfor
+                </div>
+              </div>
+            </nav>
+        % endfor
     % else:
-    % for field in form.fields:
-        ${form.render_buefy_field(field)}
-    % endfor
+        % for field in form.fields:
+            ${form.render_buefy_field(field)}
+        % endfor
     % endif
   </section>