Fixed bug with 'setle' CPU instruction
Added test descriptions to output for 'setle' CPU instruction tests
Added tests for 'xlat' CPU instruction
Added ES segment override test for 'xlat' CPU instruction
Tidied up and added more scenarios to tests for 'cmp' CPU instruction
Added tests for 'lidt' CPU instruction
Added tests for and fixed issues with 'lss' CPU instruction
Fixed bug with 'shr' CPU instruction when dealing with very large 32-bit numbers

- Shift with zero-extend must be used, unlike 'sal'
Added tests for 'and' CPU instruction