MPA

This task is about fix small OS X related issues.

1. Fix modal windows closing:
In all the modal windows, there is an alert sound when clicking outside the modal window.

The expected behavior is that the modal window is being closed when clicking outside the modal window panel:

• Remove the alert sound
• Close the modal window when clicking outside the modal panel 

This should be done for all modal windows, including:

• Create collection modal window 
• Create new folder modal window 
• Import files modal window
• Edit tags modal window 
• Audio settings modal window 

It would be good to make it as a general fix for all modal windows, so that we don't have to fix again for new windows added in the future.


2. Fix files export via drag and drop:
In various places of the app, it is possible to drag and drop datas to export files outside of the app.
This has been added for the sound library home page samples (popular samples column) and the projects revisions.

The issue is that the export icon appears as soon as the user clicks on the file tittle and not when performing the mouse drag event.

We should fix it so that the export icon appears only when a drag mouse event occurs, the developer working on this feature can't fix it because it seems to occur only on OS X and he develops on windows.

Also, for the samples on the home page, we should allow the export only for local files.

The video below shows the 2 places where the issue should be fixed:
https://www.dropbox.com/s/8eqmxnombyj3frm/files%20export%20issue.mov?dl=0

done