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/graphics/ObjectBase.h

@@ -55,7 +55,7 @@ public:
 		// name of the prop point to attach to - "Prop01", "Prop02", "Head", "LeftHand", etc ..
 		CStr m_PropPointName;
 		// name of the model file - art/actors/props/sword.xml or whatever
-		VfsPath m_ModelName;
+		CStrW m_ModelName;
 	};
 
 	struct Decal