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Issue #2052389 by pwolanin: Fixed All elements added to the Request attributes should have a _ prepended unless they come from the path.

Issue #1845402 by Crell, amateescu, dawehner, klausi, g.oechsler: Change notice: Update menu link access checks for new router.

The current matcher is a temporary legacy shiv to support the old routing system.
Label it as such so that we can reserve the class name for the new and imroved
router.

Clean up the UrlMatcher now that we don't need to do as much hackery with the path. It's handled elsewhere.

Switch to a new UrlMatcher and RouterListener so that we can use a full Request object for routing purposes, and look to the attributes for our main routing information.

Simplify the UrlMatcher to just deal with Drupal menu items directly. We will likely bypass it and write a wholely new one later for the new routing system, and this better supports existing esoteric routes.

Convert exception handling from multiple listeners to a single subscriber class for all response types.

Add BC shiv to keep old-style Dirty URLs working.  This should be a temporary fix only, and be removed later.

This will bubble down to the request and since that will be passed around, make
a lot of integration with Symfony and transitioning easier.

This is a transitional implementation but by using the UrlMatcherInterface
we can embed our matching logic directly into Symfony's routing logic.