Hide custom rating to players (non-public, admin only custom rating)

Enable hiding of custom ratings to players, i.e. a toggle on/off 'is public' button for custom ratings making rating non-visible to any members, only visible to admin.

We would like to create an internal 'custom rating' as we have issues with players often not rating themselves correctly, making it difficult to group players for lessons and match play.

This needs to be not publically displayed to the players, as it will likely be different to what they would (prefer to) rate themselves.

This can also allow for different types of uses other than rating, to mark/group customers in certain ways that is easier than adding them to a group.