First half of fix for %EXEPATH% in cmd params also respecting 8:3 naming setting

Should run correctly in all circumstances, but form string for CMD won't yet update if you (un)tick the box...
Minor change to 8:3 text rendering logic in Run Dialog

No need to send empty string....
8:3 in %eEXEPATH% cmd arg - Text box for command line params now looks correct

Reverse engineered and not 100% understood for the moment - so the code looks a little crazy, but both text and CMD output are tested 100% correct