* Support for 64bit integer values and non-continguous memory regions
* Add support for relative mode parameters
* New opcode to adjust relative mode base value
* Legacy 32bit integer API is preserved via simulate()
* Programs may start at non-zero instructions
* Input uses mutable VecDeques and consumes values as they are encountered
* Output uses a mutable vector, and multiple outputs will be pushed on it
* If no value is present in the input queue, the program blocks on input
returning the status Status::WaitingForInput and the instruction to resume
the program from.
Kienan Stewart