Smarter auto fallback (#2162)

* Smarter auto fallback

* remove config from blueprints

* Add tests for error formatting

* Add check for proper format

* Fix some tests

* Add some tests

* docstring

* Add accept matching

* Add some more tests on matching

* Fix contains bug, earlier return on MediaType eq

* Add matching flags for wildcards

* Add mathing controls to accept

* Cleanup dev cruft

* Add cleanup and resolve OSError relating to test implementation

* Fix test

* Fix some typos

sanic/models/futures.py

@@ -24,6 +24,7 @@ class FutureRoute(NamedTuple):
     unquote: bool
     static: bool
     version_prefix: str
+    error_format: Optional[str]
 
 
 class FutureListener(NamedTuple):