Implement quick load hotkey

[lL1l1]

Description of the proposed changes

Resolves #6582.
It's basically a combination of copied quicksave and doLoad code.

Testing done on the proposed changes

Assign the save and load hotkeys, create a save, and then load from during game loading, in-game, and on the score screen.

Additional context

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in a changelog snippet according to the guidelines.
• Request 2-3 reviewers from the list of reviewers and their areas of knowledge.

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