Fix clipboard issue

[bartbroere]

Just now I was using the Quadratic spreadsheet but I didn't get copying and pasting to work while using the Dvorak layout. It didn't work for Ctrl + QWERTY's C location and for Ctrl + Dvorak's C location.

The interchanged use of event.code and event.key seemed intentional, but because Ctrl + QWERTY's C location on my pc translates to Ctrl + j. In Chrome this opens my Downloads view.

It might be less confusing if we don't have the shortcut as Ctrl + QWERTY's C location, but simply as Ctrl + c.

If we want to change this for the following key shortcuts, I could also do it for all the other shortcuts that may have unintended side effects.

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[davidkircos]

Sounds like for letter keys that change in different layouts using .key is better and for modifier keys the .code is better

[bartbroere]

Sounds like for letter keys that change in different layouts using .key is better and for modifier keys the .code is better

I agree, and have the category "letters" include things like the period and the slash as well. Their locations vary with different layouts.

[jimniels]

Fixes #426