Make it possible to underscore folder in include paths with css supersets

[jens1o]

Changes proposed:

• Add

[codecov]

Codecov Report

Merging #996 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #996   +/-   ##
=====================================
  Coverage     100%   100%           
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  Files          44     44           
  Lines        2110   2110           
  Branches       99     99           
=====================================
  Hits         2110   2110

Impacted Files	Coverage Δ
src/icon-manifest/supportedFolders.ts	100% <ø> (ø)	⬆️

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[JimiC]

Can you provide any doc or reasoning for this PR?

[jens1o]

For example here: https://github.com/imperavi/kube

In this repository, and in others, they use it to mark dependencies(that are included in the framework), so not any file is directly at the top but in a clean view.

[robertohuertasm]

I thought this underscore convention was just for partial files in sass and less and somehow assumed that it had extended to folders too, but I've found #384 and it seems to be a very old issue that still has not been closed.

After googling a little bit for "_sass" and "_scss" I haven't found any official docs about the use of this syntax. I've seen that some projects like Jekyll and Docker make use of it, but I'm under the impression that they use it to remark some kind of prebuild vs final state. And I say so because they also use this convention with _includes , _layouts...

[JimiC]

So if we are to map also underscored folder names (along with the dotted ones) I suggest we add a marking enum mechanism (like we do with language) and generate the mapping internally.

[jens1o]

I like that idea. (Closing because this will be handled otherwise)