Provide builder API for option objects

[mysticfall]

For instance, Route provides various apply methods which would instantiate the route instance with different properties.

However, when there are many options, providing factory methods for every combinations of them would be nearly impossible and using such API can be quite cumbersome and error prone.

Better approach would be provide a builder style API, like below :

val route = RouteBuilder().withTemplate("...").withTitle("...").build