Don't like new "diff" method for comparing test cases

[Lyrical]

In VScode, the diff editor normally displays diffs like this:

In competitive programming, this is extremely unhelpful, because it is normally the case that there are differences on certain lines, as opposed to there being inserted / deleted lines in the input and output.

I would rather just have the expected output / normal output side by side.

[Marcelo Fornet]

Thanks for the feedback @testitem. Totally agree with you. Will rollback the diff, but keep displaying test cases side by side.

[Salil Gokhale]

Fixed with #53