Programmatically generate better method signatures for instruction methods

[postmodern]

Programmatically generate method signatures with required operand arguments and optional operand arguments for each instruction. This would entail finding the minimum and maximum number of operands for each instruction and building a list of arguments (ex: op1,op2,op3=nil). The generated argument list could be used in both the instructions.rb.erb file for the instruction method and the instruction.rb.erb file for the initialize method.

This will prevent accidentally calling an instruction with the wrong number of arguments.