Refactor searching text attributes.

* Allow using ApplicationRecord#attribute_matches to search text attributes,
and standardize models on using this instead of duplicating code.

* Remove restrictions that limited wildcard searches to Builders only in various places.

app/models/note_version.rb

@@ -18,6 +18,7 @@ class NoteVersion < ApplicationRecord
     end
 
     q = q.attribute_matches(:is_active, params[:is_active])
+    q = q.attribute_matches(:body, params[:body_matches])
 
     q.apply_default_order(params)
   end