Releases for Relation add

Bug fix:
- Autocomplete with CRM Core contacts not working anymore. #2669154
- Conflict with Devel's query log / page timer etc. #2629894

Features:
- Relation field widget with relation type with infinite arity. #2010286
- Add hook to load entities in relation_add_block. #2635502
- Limit populated list using a custom view. #1530826

Little bugfixes and move relation global settings to the instance setting.

• Issue #2270001 by mr.york: Move relation global settings to the instance setting
• Issue #2404779 by mr.york: Implode error messages since upgrade
• Issue #2398287 by AndrewsizZ: Have Error on reverse relation type
• Issue #2191933 by AndrewsizZ: Notice: Undefined index: endpoints warnings when used with CRM Core entity type

This release contains many bug fixes and some new features.
The main improvements can be found at the field widget, such as file upload, directional relation fixes and some smaller issues.
One of the important new features is that now a permission can be assigned to a role to regulate who can access the endpoint autocomplete path, which reduces data leakage.

Add relation widget support.