Add support for optional middle segments #179
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Looking at the source, I thought the limitation of allowing optional parts only in the end of the route definition was rather arbitrary and made some route definitions much more complex than they needed to be.
This PR rewrites the parsing logic for optional parts in order to allow optional parts in the middle of routes, instead of just allowing them in the end.
I tried to maintain as high compatibility with the existing parsing logic failures as possible to avoid unnecessary backwards compatibility breaks while allowing new behavior.