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/allocator/adaptive.hpp

@@ -1,4 +1,4 @@
-#ifdef NALL_STRING_INTERNAL_HPP
+#pragma once
 
 /*****
   adaptive allocator
@@ -119,5 +119,3 @@ auto string::_resize() -> void {
 }
 
 }
-
-#endif

nall/string/allocator/copy-on-write.hpp

@@ -1,4 +1,4 @@
-#ifdef NALL_STRING_INTERNAL_HPP
+#pragma once
 
 namespace nall {
 
@@ -88,5 +88,3 @@ auto string::_copy() -> char* {
 }
 
 }
-
-#endif

nall/string/allocator/small-string-optimization.hpp

@@ -1,4 +1,4 @@
-#ifdef NALL_STRING_INTERNAL_HPP
+#pragma once
 
 /*
 small string optimization (SSO) allocator
@@ -91,5 +91,3 @@ auto string::operator=(string&& source) -> type& {
 }
 
 }
-
-#endif

nall/string/allocator/vector.hpp

@@ -1,4 +1,4 @@
-#ifdef NALL_STRING_INTERNAL_HPP
+#pragma once
 
 /*
 vector allocator
@@ -80,5 +80,3 @@ string::string() {
 }
 
 }
-
-#endif