GNUSim8085 doesn't remember last file or folder location

[murtraja]

Hello,

Whenever you run GNUSim8085, it shows a basic skeleton program. We need to manually open the file which we were working on since the last time. Moreover, the open dialog, doesn't save the previous location, so have to give the complete path.

Is there a way in which we can make opening files easier like recently opened? Here are some ways which I can think of making the process easier

1. Simply open the last file which user was working on
2. Show recent files in the File menu
3. Remember the last open location, instead of showing documents every time
4. Let user set a preference of which folder to display by default when clicked on open button

Would be glad to submit a PR for the same after getting your ideas and thoughts.