Routing: Responder Classes

[smichaelsen]

• [x] Make it possible to just provide a plain string responder in the routing array.
• [x] Define classes for the different responder types (Controller, Callable, Subrouting, String)
• [x] Introduce a factory that determines the responder type from the routing array and configures the object
• [x] The objects need to know how to dispatch them selfs, move that code away from the Dispatcher
• [x] Make it possible to define custom responder types via signal/slot
• [ ] Make Subrouting work again
• [ ] Cover all new classes with Unit Tests

[smichaelsen]

Possible source of inspiration: https://github.com/xperseguers/t3ext-routing