Add dartson-@Property to enable out of the box compatibility with code generated for e.g. Java

Author: Andreas Reiter

modules/swagger-codegen/src/main/resources/dart/model.mustache

@@ -4,6 +4,7 @@ part of api;
 @Entity()
 class {{classname}} {
   {{#vars}}{{#description}}/* {{{description}}} */{{/description}}
+  @Property(name: '{{baseName}}')
   {{{datatype}}} {{name}} = {{{defaultValue}}};
   {{#allowableValues}}{{#min}} // range from {{min}} to {{max}}{{/min}}//{{^min}}enum {{name}}Enum { {{#values}} {{.}}, {{/values}} };{{/min}}{{/allowableValues}}
   {{/vars}}