Move feedback_result into multi_message_feedback
Reduce copying in colored MP message
Improve strlen usage
Simplify preparing secret level text in MP game setup
Remove repetitive short name in program setup
Suppress duplicate registration of the same configuration prefix
Check for game-specific prefix before general ones
Make Hack_DblClick_MenuMode static
Mark ui_messagebox button strings const
Remove unused nm_messagebox_fixedfont
Clean platform handling