Add <swiftInstall>/bin to library lookup paths

Summary:
This change adds <swiftInstall>/bin to the library lookup paths.
Without, QFactoryLoader is not able to find the Qt plugins
on Mac OS since on this platform the hard coded path defaults to
'foo.app/Contents/MacOS' for app bundles.
This change also adds the installation of QtPrintSupport framework which
is a dependency from cocoa platform plugin.

ref T48

Reviewers: kbasan, msutcliffe

Reviewed By: kbasan

Subscribers: jenkins

Maniphest Tasks: T48

Differential Revision: https://dev.swift-project.org/D15

src/swiftlauncher/main.cpp

@@ -11,6 +11,7 @@
 #include "blackgui/guiapplication.h"
 #include "blackcore/registermetadata.h"
 #include "blackcore/db/databasereaderconfig.h"
+#include "blackmisc/directoryutils.h"
 #include "blackmisc/logmessage.h"
 #include "blackmisc/icons.h"
 
@@ -29,6 +30,9 @@ using namespace BlackCore::Db;
 int main(int argc, char *argv[])
 {
     //! [SwiftApplicationDemo]
+#ifdef Q_OS_MAC
+    QApplication::addLibraryPath(CDirectoryUtils::applicationDirectoryPath());
+#endif
     CGuiApplication::highDpiScreenSupport();
     QApplication qa(argc, argv); // needed
     Q_UNUSED(qa);