Corrected a few errors in the CSV

SHL & SHR have 1 argument, I had set it to 2.
Added code.asm to ignore, that's my test outputfile
Added a bit of code to write to a code.asm file
Added addr & opcode to UNKNOWN OPCODE

Only if either or both are selected, if not then only UNKNOWN OPCODE
will be written on screen/in file