Add ability to disable anonymous access in the space permissions

Problem Definition

Although anonymous access can be disabled in the global permissions, it can still be enabled in space permissions. Since users in the 'confluence-users' group have access to any content allowed for anonymous access, then all users in that group will be able to see the spaces where anonymous access is enabled, even though it is disabled at the global level.

Suggested Solution

Disable/hide the anonymous section under Space permissions when global anonymous permissions are disabled.