Magick.NET 7.0.7.700

Changes in Magick.NET:

• Added extra NuGet package for the x64 build that has OpenMP support.

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

• Correct handling of GIF transparency (reference ImageMagick/ImageMagick#831).
• Support URW-base35 fonts.
• Fixed numerous memory leaks (reference https://github.com/ImageMagick/ImageMagick/issues).

Library updates:

• jpeg 1.5.2
• zlib 1.2.11