File highlight plugin: Support line ranges

[RunDevelopment]

Description
When writing tutorials, it's useful to only display parts of a file, so only line x to line y. The File highlight plugin should support this functionality.

The idea is that you can add an additional data-range attribute to the <pre> and it will only display the lines in that range. E.g. data-range="1,5".

This should be compatible with Line numbers.

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Continuation of #1810

[atomize]

Hooray! thanks for the infoz on how to build... I think this is good to go: #1813 - seems to be working on the page build and I over commented the additions in the source file just in case. 🤓
Note that I changed the File-Highlight plugin index.html to demonstrate it working. You may or may not want to keep this/let me know how you would like it to be if you need me to do that as well.

[atomize]

hmm not sure why this time it seems to be failing checks. any insight? #1813
edit:
nevermind, some gulp thing from my package.json... I got it.

[jianghong3]

If the requirement is 1-4 lines are highlighted green and 5-8 lines are highlighted red, what should I do？

[RunDevelopment]

Closed by d38592c,