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

nall/string/transform/dml.hpp

@@ -1,4 +1,4 @@
-#ifdef NALL_STRING_INTERNAL_HPP
+#pragma once
 
 /* Document Markup Language (DML) v1.0 parser
  * revision 0.03
@@ -265,5 +265,3 @@ auto DML::markup(const string& text) -> string {
 }
 
 }}
-
-#endif