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/eval/evaluator.hpp

@@ -1,7 +1,6 @@
-#ifdef NALL_STRING_INTERNAL_HPP
+#pragma once
 
-namespace nall {
-namespace Eval {
+namespace nall { namespace Eval {
 
 inline auto evaluateExpression(Node* node) -> string {
   #define p(n) evaluateExpression(node->link[n])
@@ -144,7 +143,4 @@ inline auto real(const string& expression) -> maybe<long double> {
   }
 }
 
-}
-}
-
-#endif
+}}