* Rename to `sortUserSkins` to convey meaning better.
* Sort in-place instead of slicing the list.
* Change to `void` to avoid misleading users that the method returns
a new list instance.
* Fix typo in comment.
The previous code was very brittle - it was not always updating
properly, and seems to have worked either by a carefully crafted set of
circumstances, or just plain coincidence.
Having this be a get-only property avoids potential error in the future
caused by not updating the index properly, at the expense of an added
linear lookup.
There are 3 modes: enabled, limited, and disabled.
The limited mode hides identifiable information such as username, rank, and
(if participating in one) multiplayer lobby name.
I tried also updating the colours to the "new" versions from designs but
they don't match due to colour profile differences (so I'm not yet sure
if they are correct or not) and also don't look great without all the UI
elements also being updated.