command quoting

[adamyg]

Address cmd.exe quoting issues/rules, when quoted elements are present within the command line.

   If /C or /K is specified, then the remainder of the command line after  the switch is processed as a 
   command line, where the following logic is used to process quote(") characters:
            
    1. If all of the following conditions are met, then quote characters on the command line are preserved:
            
         - no /S switch.
         - exactly two quote characters.
         - no special characters between the two quote characters, where special is one of : &<>()@^ |
         - there are one or more whitespace characters between the two quote characters.
         - the string between the two quote characters is the name of an executable file.
            
    2. Otherwise, old behavior is to see if the first character is a  quote character and if so, strip the leading 
        character and remove  the last quote character on the command line, preserving any text after the 
        last quote character.

If embedded quotes are detected, enable the older behavior (2) by encasing the command within double
quotes when additional quotes are encountered..