Prompt to save script

[AmberSJones]

It would be very helpful and prevent the loss of work by prompting to save the script when the program is closed. This has been requested by technicians.

[sreeder]

@AmberSJones ready for testing on savedialog branch

[AmberSJones]

This is working, but needs a few tweaks:

1. The dialog is missing a "?"
2. If the user clicks "Yes", then the dialog for saving the script should appear.

[AmberSJones]

Addressed.