Implement under/over parens/shells, refactor code #3869
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I decided to use the word
shell
instead of turtle or tortoise because I think it is a bit clearer, the word reads nicer (“overshell” vs “overturtle”), and there is no associated discussion (they are called “tortoise shells” in Unicode):There will be a sibling PR to rename the symbols too.
Additionally, I refactored some code to make it more readable.
I also fixed a bug introduced in #3262 where the wrong script style was being used.
Closes #3856.