Issues with new main menu

[Night-Pryanik]

Describe the bug

• Scrolling down on credits/MOTD to the very end AND further down (for example, press down 3 times after you've scrolled to the very end) make the game require pressing up 3 times before text begins to scroll up;
• There is no sound of highlighting the menus by hovering the mouse, while manual old-style switching (pressing left or right) produces sound;
• Popup prompts like when pressing "Delete world" (Delete world and all world within?) or Really quit? are not mouse-clickable.
• Tertiary menu options (Manage world: Foo) can be pressed by left mouse button, but you can't return to previous menu by pressing right mouse button, like in secondary menus.

Steps to reproduce

See above.

Expected behavior

See above.

Screenshots

No response

Versions and configuration

Windows 10 x64, 0.F-8778.

Additional context

No response

[Ezrashaw]

The scrolling issue is a result of the 'sel_line' variable not being capped at the texts end. I'm writing a pr now which changes both the 'mmenu_motd' and 'mmenu_credits' to vectors instead of plain strings. We really need an internal function like 'fold_and_print_from' that accepts a vector of strings instead of a single string separated by newlines.