Add the Open from Damned Lies(DL) button

Daniel Garcia Moreno requested to merge open-dl-button into master

A user can view two buttons in the main window when no file is opened. These buttons are namely: Open & Open from DL.

However, if a file is opened, the user can view only the Open button. Thus, a user cannot load files from Damned Lies.

To fix this make the Open from DL button visible when a file is opened. Prompt a user to save an edited file before the open button is opened.

Closes #65 (closed)

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