Add "member" and "method" to default types of the HTTP router

[SanderMertens]

Like with structs / classes, it would be convenient if the HTTP router specifies a default type and default procedure type, so that instead of this:

httprouter/Router MyRouter:/
    int16 construct() method
    member m: int32
    GET home: "/"

a user can do:

httprouter/Router MyRouter:/
    int16 construct()
    m: int32
    GET home: "/"

This can be achieved by adding defaultType=member and defaultProcedureType=method to the Router type in the httprouter.cx file.

[Jarota]

@SanderMertens I'll give this a go!

[SanderMertens]

@Jarota Awesome! If you have any questions or would like to discuss something in realtime, just shoot a message to sander@corto.io and I'll add you to our Slack!

[subhammaji]

Please assign me this task