Updates data paths on OS X and Windows. On OS X only write to locations inside ~/Library. On Windows make the distinction between local and roaming appdata, and use folder inside My Documents for user-created data. Fixes #1145.

Adds proper OS X app bundle support.
Updates Windows installer script.

This was SVN commit r11389.

source/ps/DllLoader.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2011 Wildfire Games.
+/* Copyright (C) 2012 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -25,6 +25,10 @@
 #include "ps/CLogger.h"
 #include "ps/GameSetup/Config.h"
 
+#if OS_MACOSX
+# include "lib/sysdep/os/osx/osx_bundle.h"
+#endif
+
 static void* const HANDLE_UNAVAILABLE = (void*)-1;
 
 // directory to search for libraries (optionally set by --libdir at build-time,
@@ -70,8 +74,23 @@ static CStr extensions[] = {
 static CStr GenerateFilename(const CStr& name, const CStr& suffix, const CStr& extension)
 {
 	CStr n;
+
 	if (!g_Libdir.empty())
 		n = g_Libdir + "/";
+
+#if OS_MACOSX
+	// On OS X, we might be in a bundle in which case the lib directory is ../Frameworks
+	//  relative to the binary, so we use a helper function to get the system path
+	if (osx_IsAppBundleValid())
+	{
+		CStr frameworksPath = osx_GetBundleFrameworksPath();
+		if (!frameworksPath.empty())
+		{
+			n = frameworksPath + "/";
+		}
+	}
+#endif
+
 	n += prefix + name + suffix + extension;
 	return n;
 }