New to this release
NSImageView updating now done on main thread. - Now redraws while dragging slider! (on 10.11) - And GUI now works on versions of macOS where it did not used to!
GUI (NSImageView) is buggy, sometimes app window needs resizing to make it update.
NSImageView seems to be leaking memory like mad, I think due to me updating it not from the main thread(will be fixed) seems to be coming from elsewhere