workflow 8.x-1.0-rc1

This release has the following changes, compared to version beta6:

Most important new features:
Issue #2922508: Enable Workflow on Comments
Issue #2697023: Hide Workflow Field module on modules page
Issue #2897245: Add 'Drop button' as alternative for Action Buttons on Workflow form

Bug fixes and other coding issues:
Issue #2922843: Undefined index: group_info in views/filter/WorkflowState
Issue #2860396: Fix Unnecessary 'Rebuild permissions'
Issue #2922733: Add method $transition->LogError()
Issue #2905308: Fix field value is not restored when transition is inhibited
Issue #2919425: Remove a comment settings (on Node vs On Tab)
Issue #2919429: Fix Action configuration page
Issue #2919404: Add return value 'success' to WorkflowManager~executeTransitionsOfEntity
Issue #2734543: Error: The 'workflow_type' entity type did not specify a 'add...
Issue #2796705: Error 'Route entity.workflow_type.canonical does not exist' p...
Issue #2913087: Avoid using 'canonical' link templates on unknown e...
Issue #2919305: Action 'change a node to next workflow state' does not respec...
Issue #2919311: Correct Action 'Change a node to new Workflow state'
Issue #2919266: Avoid setting an Entity to empty State
Issue #2919214: No/Too many Primary Action buttons on node form, workflow tab
Issue #2909700: Error: Unsupported operand types in workflow_form_alter() in ...
Issue #2906443: Remove the unsupported 'fieldable' option from Entity
Issue #2896666: Add routes for workflow_scheduled_transition
Issue #2896650: Fatal Error when creating Scheduled Transition in Workflow Ta...
Issue #2896639: Error: Scheduled Transition is executed immediately when scheduled i...
Issue #2896633: Add entity link to warning in Field settings