[FEATURE] Add short help for (and more) keyboard shortcuts

[polypixeldev]

Description

It's a little unclear what the keyboard shortcuts in Sinerider are, if there are any. I know of Enter to start running the equation, but it would be nice to have keyboard shortcuts for advancing to the next level, or going into the map after finishing a level.

Screenshots

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Additional information

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[polytroper]

This is a good idea. Will need to think about what the shortcuts should be. Maybe we can add a tab to the settings menu to list them.

would you be interested in taking this issue on?

[polypixeldev]

Sure! Would just an unordered list of shortcuts in the settings menu work?