Wizard DSL

The Java version has a [DSL](https://github.com/LMAX-Exchange/disruptor/blob/ae5ba82361c53a764a7ffa7b0e73a7471970dd7b/src/main/java/com/lmax/disruptor/dsl/Disruptor.java) for specifying whole deployments with dependencies between consumers etc. Also helps against forgetting `setGatingSequences` on the last consumer for example.

Depends on #5.