title: Where are "System icons" located?
body: <p>I just downloaded Xcode 11 Beta, started a simple project to see what's new, and saw that in storyboard when you select a button/image in Attributes Inspector in "Image" drop down menu there are new system icons. I want use this icons in my non-Beta Xcode for my project, where are this files located in finder so I can copy them?</p>