[ticket/15951] Add core.mcp_delete_topic_modify_permissions
Allow modification to permissions when deleting topics
This allows $check_permission to be false in the phpbb_check_ids function call
[ticket/15951] Add core.mcp_modify_permissions
Allow non staff to access mcp functions
This event would allow normal users to delete topics, for example
If extensions need normal users to access this file they will need this event