Great post! Very needed. Language is the arena, the weapon and chalice of political freedom.
Orwell may be the more eloquent and far-seeing sources on this matter in recent times. But there also are some older explorations, particularly by the rhetoricians, of truth which bear on the lie, from which we get the terms {suggestio falsi} and {suppressio veri} among others. (It's interesting isn't it? that until modern mass democracy political philosophy didn't pay much attention at all to lies.)
Terms like "unconscious lie" and "deliberate falsehood" are more recent creations possibly created to clarify what people mean when talking about lying.
@dwinblood I would add to your definition of lying (that it is intentional) that the aim is to deceive and not necessarily maliciously.