[flashrom] Documenting flashrom's guts

[Angel Pons]

Hi list,

There's several things regarding flashrom's structure that seem to be
underdocumented (or *are* documented, but the information is extremely
hard to find). It would be very helpful to have this information
available somewhere easy to find, such as the Wiki. Some things that
would greatly benefit from being documented are:

- flashrom's layers: which layers there are, and how they interact
with each other.
 - flashrom's structures: which structures there are, how they
interact with each other, and how they "map" to layers.

Surely there are more things that would benefit from being documented.
Let's not discuss *who* is going to do what for now; first, let's
collect information about these parts of flashrom.

Best regards,
Angel