Progress: Continue adding FSS Payload processing code.

Progress: Continue adding FSS Payload processing code.

I started doing some re-designing to improve the approach and prepare for signatures/checksums.

I realized somewhere during that process that I wanted to eventually control or even randomize the header order for integrity, organization, or security reasons.
The current approach makes that impractical.

I decided to save the current state so that I can then pivot to a better approach that will accommodate the above needs.
Appropriate todo notes are added to this end.

A lot of the existing payload code will be re-designed, again, as a result of this.