Issue #1946466 by tim.plunkett, andypost, jibran, Unitoch, Crell, disasm | mtift: Convert all confirm_form() in user.module and user.pages.inc to the new form interface and convert route.

Issue #366950 by amontero, boombatower, brianV, univate, hefox, stpaultim, EllaTheHarpy, babruix: Fixed 'Administer Users' permission should be separate from 'Administer Account Settings'.

Issue #1987692 by becw, cbiggins, tim.plunkett | vijaycs85: Convert all references to entity_get_form() as page callbacks to _entity_form() w/ corresponding routing.yml entries.

Issue #1987814 by juampy, tim.plunkett, lliss, kushrohra: Convert system_admin_menu_block_page() to a new style controller.

Issue #1938888 by tim.plunkett, ayelet_Cr, amateescu: Convert user_admin_permissions() to a new-style Form object.

Issue #1984610 by Albert Volkman, dawehner, tim.plunkett: Convert user_pass() to a new-style Form object.

Issue #2008356 by dawehner, tim.plunkett: Provide a _entity_list() route default to replace Controller\EntityListController and mimic _entity_form().

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

Issue #1924992 by tim.plunkett, kim.pepper, damiankloip, amateescu: Convert user's system_config_form() to SystemConfigFormBase.

Issue #1915774 by tim.plunkett, amateescu, Crell, dawehner: Decide whether core route controllers should generally/always be DIC services or not.

Issue #1793520 by disasm, klausi, tnightingale, Crell: Add access control mechanism for new router system.