Create orientation-scroll-reflow-acsmtl

[WilcoFiers]

First draft of the orientation-scroll-reflow rule: orientation scrolls do not exist at 320 CSS pixels without a content exception.

Split from #2429 so each reflow rule can be reviewed independently. Original work by @HelenBurge.

Related to #2424.

Need for Call for Review:
This will require a 2 weeks Call for Review

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