Create actions (bulk operations) for bibliographic entity types

Problem/Motivation

User should have an ability to execute basic operations (save, update, delete) on multiple entities.

Proposed resolution

Create actions plugins for bibliographic entities and override admin page by View with "Bulk operations form" handler.

Remaining tasks

1. Create actions plugins and configuration for bibliographic entity types
2. Create common administration views
3. Pack views configuration as optional to bibcite_entity module

Original issue:

Hi! Is there any way to delete many / all of the references as once? I imported a bunch of data, but it doesn't seem to have worked well, so I want to remove all of the reference entities and try again. There are 210 of them, so clicking through one-by-one is annoying.