Implement TestCritter.getOffAngle
Implement TestCritter.ifRandom
Add TestCritter.regs

This will be used to store the register values. At every register read
instruction, the user will have the option of using the value stored in
regs or entering a different value. (If the user elects to use a
different value, they can choose whether or not to store it in the
array.)
Implement TestCritter.setReg
Implement TestCritter.getReg