V8: Send notifications for changes in permissions

[kjac]

Prerequisites

• I have added steps to test this contribution in the description below

Description

You can subscribe to notifications for changes in content permissions. Unfortunately these notifications are never sent.

This PR fixes that.

Testing this PR

1. Create two users - A and B.
2. Subscribe user A to the permissions event on a content item
3. Let user B change the permissions for the content item, e.g. alter the "Editor" role permissions. Verify that user A is notified about it.
4. Let user B undo the changes made, and verify that user A is notified about it.

Hint: This SMTP configuration might make testing a bit easier 😄

<smtp from="[email protected]" deliveryMethod="SpecifiedPickupDirectory">
  <specifiedPickupDirectory pickupDirectoryLocation="Path\To\Site\Root\App_Data\MailDump" />
</smtp>

[emmaburstow]

Excellent description as usual! Thanks Kenn, speak soon,

Em

[nul800sebastiaan]

👍