Major update for SCSS layout generation, including setting primary regions to assign width to when other regions are missing. _omega_compile_layout_sass() will require a refactor later to simplify code and allow for using the primary region functionality on region groups with more than 4 regions.
Updated logic to account for content first rearrangement after a missing region is present in a region group with a primary region set. This ONLY works currently in a region group with 3 regions or less.