Add config for supported vendor catalog parsers

also explicitly set "native value" for all configuration checkbox
fields, since apparently it will send `'false'` by default...

tailbone/templates/batch/vendorcatalog/configure.mako

@@ -10,12 +10,42 @@
     <b-field>
       <b-checkbox name="rattail.batch.vendor_catalog.allow_future"
                   v-model="simpleSettings['rattail.batch.vendor_catalog.allow_future']"
+                  native-value="true"
                   @input="settingsNeedSaved = true">
         Allow "future" cost changes
       </b-checkbox>
     </b-field>
 
   </div>
+
+  <h3 class="block is-size-3">Catalog Parsers</h3>
+  <div class="block" style="padding-left: 2rem;">
+
+    <p class="block">
+      Only the selected parsers will be exposed to users.
+    </p>
+
+    % for Parser in catalog_parsers:
+        <b-field message="${Parser.key}">
+          <b-checkbox name="catalog_parser_${Parser.key}"
+                      v-model="catalogParsers['${Parser.key}']"
+                      native-value="true"
+                      @input="settingsNeedSaved = true">
+            ${Parser.display}
+          </b-checkbox>
+        </b-field>
+    % endfor
+
+  </div>
+</%def>
+
+<%def name="modify_this_page_vars()">
+  ${parent.modify_this_page_vars()}
+  <script type="text/javascript">
+
+    ThisPageData.catalogParsers = ${json.dumps(catalog_parsers_data)|n}
+
+  </script>
 </%def>