Initial opcode reading support

[Stephen001]

For this month I'll be developing an initial implementation of reading opcodes and static values from a binary file, producing opcodes in memory and priming registers.

The scope of the task is as follows:

• Design a format for opcodes and static values in file.
• Implement stream iterator logic for reading this format into tokens.
• Tie up register references and static values to opcodes, leaving a stack of opcodes to be executed.

The deliverable for this task will be new code pushed to github.

[Stephen001]

Task will be called complete due to commit d50321948d589f9a3f59, although it's not really. The opcodes themselves are not read, and so nothing is tied up into a neat stack of stuff to be executed. Realistically these should be two tasks anyway, as execution is different to priming.