Improve log tracking/display for user merges and username changes

[Mouth]

When an account has been merged, it's impossible to determine username changes vs user merges.
Admin cannot determine questions such as;

• Was it a username change or a merge?
• Was there username changes prior to a merge?
• What was the user original registration username?

https://xenforo.com/community/threads/deciphering-username-history-changes-and-merges.222448/ for example discussion/efforts with existing information and logs to try and answer such questions.
Improve log tracking/display for user merges and username changes

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