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Implement an auto-scroll setting for GUI lists.

Description

Implement an auto-scroll setting for GUI lists.

Patch By: fpre / ffffffff
Fixes #4987, refs #4254

This allows the replay menu and lobby to focus the selected element if, but only if it is expected by the user.
Replaces rP18935 which scrolled the selected player into view every single time a new playerlist was received by the lobby server.