Image version 0.71.0

Added

• Adds ### Examples doctest sections to more than 220 public functions across Image and its submodules. All examples run as doctests.

• Adds a range argument (:limited or :full) to the Image.YUV encode and decode functions, and Image.YUV.valid_ranges/0. :limited (studio-swing) is the default and matches the previous behaviour.

Fixed

• Fix Image.YUV to use studio-swing (limited range) coefficients in both directions by default. Previously the encoder was studio-swing but the decoder was full-range, so YUV round trips compressed colors toward grey.

Removed

• Removes the unused internal modules Image.Nx, Image.Exif.ReadError and Image.Exif.FieldNames. These were private implementation modules with no callers.