Merge pull request Gizra#635 from Gizra/isSubclassOf-deprecated

EntityTypeInterface::isSubclassOf() is deprecated.

Merge pull request Gizra#593 from Gizra/test-drupal-8.8

Require tests to pass on Drupal 8.8.x

Merge pull request Gizra#516 from Gizra/pass-role-ids

Do not require to pass full OgRole objects when we only need the ID.

Merge pull request Gizra#451 from Gizra/get-group-memberships-by-roles

Provide a way to retrieve all group memberships by role

Merge pull request Gizra#420 from Gizra/store-bundle-in-membership

Performance: Store the group bundle in the membership entity

Merge pull request Gizra#390 from Gizra/7.x-2.10-rc1

OG 7.x 2.10 release

Improve membership subscription

Merge pull request Gizra#107 from zero2one/patch-1

Issue Gizra#106: Order by the entity ID.

Improve validation by membership state.

Issue #2216819 by shushu, richard.thomas: OgBehaviorHandler validate …

…method removes errors for other fields.