Update to 20160106 OS X Preview for Developers release.

byuu says:

New update. Most of the work today went into eliminating hiro::Image
from all objects in all ports, replacing with nall::image. That took an
eternity.

Changelog:
- fixed crashing bug when loading games [thanks endrift!!]
- toggling "show status bar" option adjusts window geometry (not
  supposed to recenter the window, though)
- button sizes improved; icon-only button icons no longer being cut off

hiro/cocoa/widget/button.hpp

@@ -16,7 +16,7 @@ struct pButton : pWidget {
   auto minimumSize() const -> Size override;
   auto setBordered(bool bordered) -> void;
   auto setGeometry(Geometry geometry) -> void override;
-  auto setImage(const Image& image) -> void;
+  auto setIcon(const image& icon) -> void;
   auto setOrientation(Orientation orientation) -> void;
   auto setText(const string& text) -> void;