Log Board setting changes in more detail and make the log more accessible

[wens]

Recently a popular / controversial board has seen unwanted changes to its board subtitle by one of its moderators. However no one claimed responsibility.

While the system currently logs modification actions, the log is not specific enough to say what setting was modified. It is a fluke that we might be able to discern changes to the subtitle by consecutive double log entries.

Going forward we should log any changes to board settings, with details on who did what exactly.
The log should be made available to current moderators of the board and moderators higher-up.
A log accessible via hot-key or menu, like the recycle bin or personal login/money logs would be nice.