Z8 Language

[travisgoodspeed]

• Register Modes
• Condition Codes
• All instructions
• Test Cases
• First Project

Rough edges:

• Empty condition code should imply t.
• rr6 convention for register pairs.
• Self-test recognizes examples with r6 instead of rr6.

[travisgoodspeed]

We still need unique tests and a real project, as well as accepting t as a default condition code. Instruction set is complete, and I think I've caught all of the errors from the documentation errata.