parseCode returns List<Opcode> now
parseCode returns List<Opcode> now

Before, I returning a Map<Integer, Opcode> because I was including the
position in memory with the instruction. However, I realized that, at this
point, I am still tokenizing(?) the code; putting the instructions at the
correct place in memory is ---for chumps--- for the linking stage, which
will come at the end

SirPython/CHIP8-Assembler