“The implicit remedy for this one-sidedness, and the route that would be mapped out in the Treason Trials Act of 1696, was two-sidedness. The preamble to the Act would trumpet the principle of equalizing the defense, a principle that the Act would implement most fundamentally by allowing the defendant to have access to counsel both in the pretrial and at trial. Persons accused of treason would be allowed to defend themselves in the way the state prosecuted them, with lawyers. The accused would be allowed the help of lawyers to prepare defensive evidence in the pretrial, to examine defense witnesses and cross-examine prosecution witnesses, and to serve as advocates at trial.”