Add useful java editor code templates

[Alessandro Falappa]

Some Java code templates could be added by the plugin.

Ranging from simple ones e.g. gmp expanded to @GetMapping("url")

To complex ones like rtrf expanded to:

@Bean
public RouterFunction<ServerResponse> routes(PostHandler postHandler) {
	return route(GET("/url"), HandlerClass::method);
}

[Alessandro Falappa]

Here a NetBeans tutorial on plugins providing new code templates