David Robillard Contributors: * Devin Anderson * Fix reparenting of Gtk UIs in Qt * Peter Nelson * Fix crash when a broken UI returns a NULL descriptor * Filipe Lopes * Idle interface fixes for X11 in Qt4 * Qt5 in Gtk2 support * Robin Gareus * Support for resizing X11 UIs in Gtk * Cocoa in Gtk wrapper * Numerous Windows fixes * Rui Nuno Capela * Fixes for X11 in Qt4 * Qt5 wrappers * Stefan Westerfeld * Qt5 in Gtk2 support * Initialization API