Refactor tests to DRY them up a bit'
CMP opcodes implemented
CPY and CPX opcodes implemented
Decrement opcodes implemented
Increment opcodes
EOR opcodes implemented
LDY, LDX and LDA load opcodes implemented
Refactor ASL tests
LSR opcodes implemented
NOP opcode implemented
ORA opcodes implemented
Add the ROL and ROR opcodes
RTI and RTS implemented
SBC opcodes implemented
Set flag opcodes implemented
STX, STY, and STA opcodes implemented
Implement the transfer opcodes