Issue #2399219 by amateescu: Allow entity form handlers to determine the entity object they need to work with

Issue #2368275 by martin107, dawehner, znerol, Crell, Wim Leers: EntityRouteEnhancer and ContentFormControllerSubscriber implicitly depend on too many services

Issue #2068471 by dawehner, Crell, tim.plunkett, jibran, fubhy, larowlan: Normalize Controller/View-listener behavior with a Page object.

Issue #2051097 by dawehner, Manuel Garcia, tlattimore, neclimdul: Change 'pattern' to 'path' in *.routing.yml files.

Issue #2057869 by dawehner, jibran: Provide an alias for 'plugin.manager.entity' called 'entity.manager'.

Issue #1913618 by tim.plunkett, amateescu: Convert EntityFormControllerInterface to extend FormInterface.