Implement and test 0x8XY2 (VX AND VY)
Implement and test 0x8XY3 (VX XOR VY)
Implement and test 0x8XY4 (VX + VY, VF = CARRY)
Fix and run test_set_vx_to_vx_plus_vy
Test 0x00EE (RETURN) opcode