Magick.NET 7.0.6.600

Changes in Magick.NET:

• The .NET Standard library can now be used on Linux.
• Added AutoThreshold to MagickImage.
• Added MeanShift to MagickImage.

Related changes in ImageMagick since the last release of Magick.NET:

• Fixed numerous memory leaks (reference https://github.com/ImageMagick/ImageMagick/issues).
• Put UTC time in the PNG tIME chunk instead of local time (reference https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=32447).
• Added "-define png:ignore-crc" option to PNG decoder. When you know your image has no CRC or ADLER32 errors, this can speed up decoding. It is also helpful in debugging bug reports from "fuzzers".
• Added caNv, eXIf, and pHYs to the list of PNG chunks to be removed by the "-strip" option.