add io interface.
	new file:   WinSir.Tools.Photos/DirectoryProxy.cs
	new file:   WinSir.Tools.Photos/FileProxy.cs
	modified:   WinSir.Tools.Photos/IBasicIO.cs
	modified:   WinSir.Tools.Photos/IDirectoryIO.cs
	modified:   WinSir.Tools.Photos/IFileIO.cs
	modified:   WinSir.Tools.Photos/IOHelper.cs
	modified:   WinSir.Tools.Photos/WinSir.Tools.Photos.csproj