Add filename grouping function

[ghost]

Posibility to add source filename as additional folder to exported files.

[cognitom]

Could you explain the use case?

By the way, no need to change .gitignore, I think.

[ghost]

Our case for this adjustment is that we create many icons. To make this clearer, we have according to the subject a Sketch file with matching icons in it. Our desire is to retain the themes at export. Therefore, should for each sketch file, which deals with a subject, an identically-folders are created, in which the files are then exported.

This way it is faster, easier and less error happen. Since there are many workers working here. Of course we can also rename all slices with paths, but as I said we deem cumbersome and error prone.

[ghost]

By the way, to adjust .gitignore file for used OS and Tools prevent mistakes on commit with helper files. There for I like the help of www.gitignore.io :)

[cognitom]

@nahody OK, it makes sense. Thanks! But .gitignore should be another PR.