@import URL needs to be handled differently

[LennardF1989]

According to the W3C spec, an @import always has to be on top of a CSS file. Currently, when bundling multiple CSS files that all have their own @imports (on top, respectively), Smidge does not re-order those to the top of the file. This causes a website to not fully load everything it would when not bundled.

EDIT: This could however cause some strange behavior when overriding selectors, but this is mostly used for fonts anyway.

[Shazwazza]

Ok, will have to investigate since IIRC this processor should handle it https://github.com/Shazwazza/Smidge/blob/master/src/Smidge.Core/FileProcessors/CssImportProcessor.cs#L33

But maybe this is only for a single file, I can't recall off the top of my head