refactor path interface:

- use wrapper class instead of std::wstring (reduces mixing of
strings/paths; allows safe+easy join via operator/ and convenient
case-insensitive comparison via operator==, avoids NativePathFromString,
similar to boost::filesystem)
- NativePath -> OsPath
- add hash and To/FromJSVal for Path
- add TS_ASSERT_PATH_EQUALS
- replace _wfopen_s with sys_OpenFile
- remove obsolete SortFiles/Directories

This was SVN commit r9107.

source/scriptinterface/ScriptInterface.h

@@ -235,7 +235,7 @@ public:
 	 * @param code JS code to execute
 	 * @return true on successful compilation and execution; false otherwise
 	 */
-	bool LoadScript(const std::wstring& filename, const std::wstring& code);
+	bool LoadScript(const VfsPath& filename, const std::wstring& code);
 
 	/**
 	 * Load and execute the given script in the global scope.