Replace Ionic.Zip with more recent NuGet

[BardezAnAvatar]

• Split ISotsStructure.cs into two files
  • ISotsStructure.cs
  • IComplexSotsStructure.cs
• Split some code from UI out into their own projects
  • Split the UI's IO namespace out into its own project (.NET Standard 2.0)
  • Split some of the ResourceManagement namespace out into its own project (.NET Standard 2.0)
  • Updated namespaces where appropriate
  • Reference GitVersion package in new projects
• Replace Ionic.Zip with more recent NuGet
  • Deleted the Ionic.Zip assembly in the repo root
  • Replaced references to Ioniz.Zip assembly with <PackageReference Include="DotNetZip" Version="1.16.0" />

-- begin release notes --
Replaced Ionic.Zip with more recent NuGet package
-- end release notes --