Fix the URL parser for special chars in profile

[TheMarex]

Issue

The URLs used for osrm-routed have the form {service}/{version}/{profile}/{params}?{options...}. The boost spirit grammar for parsing the profile and service identifiers was artificially limited to only allow alpha-numerical characters, but any URL-safe character would be fine.

This PR additionally allows for ._-~.

Tasklist

• CHANGELOG.md entry (How to write a changelog entry)
• add tests
• review
• adjust for comments
• cherry pick to release branch

[TheMarex]

Updated the grammar. Thanks for the review @mjjbell I learned something about boost spirit again (and why I don't like it) 😆

[mjjbell]

@TheMarex one minor change left to prevent a regression.

(Ideally it would be picked up by CI but the Travis integration is broken - if you have some time, take a look at #6071 which uses Github Actions as a drop-in replacement)

[mjjbell]

One minor change to prevent regression.

[mjjbell]

👍