devel 8.x-1.0-rc1

New features:
allow to inspect the container see #2834390: Add Routes info page
allow to inspect the routes see #2828116: Add Container info page
allow to inspect the events and related listeners #2836958: Add Event(dispatcher) info page
add toolbar integration #2839502: Add toolbar integration - make devel menu items more accessible

All commits since beta1:
Issue #2839502: Add toolbar integration - make devel menu items more accessible
Issue #2840230: Register DrupalConsole commands as services
Issue #2791749: Call to a member function getReasonPhrase() on null
Issue #2841382: Webprofiler breaks cache tag invalidation on non-db backends
Issue #2841689: StateWrapper does not implement destruct()
Issue #2834400: Add warning on Status report if devel is enabled
Issue #2840366: Move devel_entity_operation() and devel_entity_type_alter() implementation to a class
Fix test fail on D8.1
issue #2703343: Remove usage of kprint_r() and kdevel_print_object()
Issue #2840361: Add default implementation of ::dump() method in DevelDumperBase
Issue #2840356: Port DevelStateEditorTest to BrowserTest
Issue #2840358: Add basic test coverage for devel_query_debug_alter()
Issue #2840367: Add all the active maintainers to composer.json
Issue #2839524: Port DevelErrorHandlerTest to BrowserTest
Issue #2836958: Add Event(dispatcher) info page
remove d7 rules integration
Issue #2828116: Add Container info page
Issue #2686687: Make rebuild_theme description in the settings page more easy to understand
Fix typo in devel_help() 7c6ea00
Issue #2834390: Add Routes info page
Issue #2832882: Split DevelEventSubscriber into multiple classes
Issue #2832798: Improve DevelMailLog
Add basic support for named dump in VarDumper plugin 3e83580
Issue #2703343: Remove usage of kprint_r() and kdevel_print_object()