Remove RouteHandler

[adam-fowler]

They are awkward to use and it is pretty much impossible to inject dependencies into them

[Joannis]

I'm all for removing - just two things:

• Any docs and examples will need to be updated
• What's the expected impact on current users? Do you expect there to be many? If so, maybe we can deprecate first.

[adam-fowler]

I'm all for removing - just two things:

• Any docs and examples will need to be updated
• What's the expected impact on current users? Do you expect there to be many? If so, maybe we can deprecate first.

Yeah, we'll need to remove them from the docs
I don't think there will be much impact. They were of some use in 1.0 but given how awkward they are to use in 2.0 I doubt there is much use.