Simple Add-ons (SAO)

While the current spec for "Simple Add-on" is identical to the latest "Shitty Add-on" v169Bis spec I have chosen to abandon the legacy numbering schema.  To prevent confusion with the original "Shitty Add-on" v1 spec I skipped over v1 in favor of v2.  This will also prevent any confusion as to which to use if someone looking for "Simple Add-on" finds the older SAOv169Bis despite them being functionally identical.

Since there are no differences SAOv2 will of course be compatible with SAOv169bis and the original 2x2 v1 spec.