replace handlebars with jinja

templates/model_mod.jinja

@@ -0,0 +1,9 @@
+{% if config.prelude %}
+pub mod prelude;
+{% endif%}
+{% if entities_path == "super::_entities" %}
+pub mod _entities;
+{% endif %}
+{% for table in tables %}
+pub mod {{table.name}};
+{% endfor %}