Add span with command-line-(input|output) class to command-line plugin lines #3312
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Currently it is not possible to distinguish between input and output, unless all input has some kind of highlighting on it. This change wraps each line with a span and class to indicate whether it is input or output.
Reasons for needing to do this so that it is possible to:
user-select: none;
for output linesFor example
The above HTML was from
![image](https://user-images.githubusercontent.com/22818309/151625323-adf143e9-e63b-4081-8a33-845fec260b16.png)