PROMPT_DIRTRIM option

[jxu]

Having an option to include PROMPT_DIRTRIM=2 or something in the Output box for copy pasting would be neat. I had to look up how to do it.

[Scriptim]

I believe this would have added too much complexity to the tool. We would have needed an additional input field on Working Directory elements (although the value would apply globally), the example preview would have had to support this option, and even the parser would have required an additional input field specifically for PROMPT_DIRTRIM's value. However, I added a hint below the output to make the user aware of the existence of such an option.