EZP-21018: Replaced urlHandler with Symfony's router

Also renamed the previous UrlHandler to RequestParser when injected
since it is still used to parse request headers.
EZP-21018: Completed Content controller
EZP-21018: Fixed Content::redirectContent
EZP-21018: Refactored url in REST ContentType controller
EZP-21018: begin refactoring of REST Location controller
EZP-21018: Completed url refactoring of Location controller
EZP-21018: Completed url refactoring of Object States
EZP-21018: Refactored role controller
EZP-21018: Refactored Section controller
EZP-21018: Changed trash routes param trashId to trashItemId
EZP-21018: Refactored Trash controller
EZP-21018: Refactored url in UrlAlias controller
EZP-21018: Refactored url in UrlWildcard controller
EZP-21018: Began url refactoring of User
EZP-21018: Completed url refactoring on Url controller
EZP-21018: Renamed groupId to groupPath in REST routing.yml
EZP-21018: Fixed url handling for deleteSession
EZP-21018: REST Tests, fixed UserTest::createSession()
EZP-21018: CS
EZP-21018: Refactored forgotten methods in User controller