Tell players if any mod actions have been used on them.

[forkiesassds]

Not sure if this requires any improvements.

Fixes #616.

[UnknownShadow200]

1. Doesn't check for who not being null, so if you try to ban/freeze/mute an offline player, it'll error
2. In my opinion, this doesn't really address the underlying issue of #616 It'd be better to change LogAction to something along the lines of PlayerOperations.MessageAction, which changes who gets messaged if the target player is in a localchat level (although the way that is implemented is also still somewhat wrong and needs to be redone)