Use key down and support key repeat in game menu

[Pinemarten]

This PR includes two changes:

• Use keyDown instead of keyUp in game menu. In vanilla Gothic 2 NOTR it's actually key down that triggers the menu action (e.g., going through menu items with up/down arrows), so this change makes OpenGothic in line with vanilla.
• Add support for key repeat. In vanilla, it's possible to hold your key to decrease/increase value on the slider in the menu. For example, it's possible to hold left arrow key to decrease the music volume. It was previously not possible in OpenGothic.

[Try]

Hi, @Pinemarten !

Thanks for PR, looks good - will test once I'm back at home, roughtly by the end of this week

[Try]

Tested PR today:

• In the main-menu vanilla has keyRepeat for UP/DOWN keys, but it's not achieved by this path\
• For no/yes options LEFT/RIGHT keys do not have loop behavior in vanilla, but still can toggle no/yes only by holding only left key
• For % options case is similar. For example view-range: in vanilla you can hold left and go as low as 20% and then it stops, in this path it loops to 300%
• For sliders - works well

[Pinemarten]

Hi @Try, thanks for testing it!
I pushed some changes. UP/DOWN works now for keyRepeat. There's no loop behavior anymore for % options and yes/no.

[Try]

Merged, thanks!

[Try]

Just to note: keyRepeatEvent in Tempest has repeat period same as OS. And usually it adjusted for text typing, not for video-games. So it's significantly faster than in vanilla-game.