#653628 by dagmar and dereine: Ensure child method declarations match parent method declarations to prevent notices.

#503452: Retool exports to properly use option definition, improving translatability and information use.

Major re-organization of handlers. PLEASE NOTE: This drastically affected the Views module API and until modules are updated to match, they will stop working. Efforts have been made to ensure that this won't cause your site to crash, but that's partly up to the individual module as well.