.NET Standard support#379

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MFinkBK wants to merge 12 commits intooysteinkrog:masterfrom

Commits on May 15, 2018

removed Windows Phone 8 and WinRT projects; not supported by .NET Standard
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converted projects SQLite.Net, SQLite.Net.Async to .NET Standard
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also removed Xamarin.iOS Classic projects
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removed files for obsolete projects
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updated .nuspec files and creating NuGet package for .NET Standard
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updated Android projects to always use latest platform SDK installed
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some changes Visual Studio 2017 wants to do to the projects
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updated projects to use PackageReferences instead of packages.config
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removed NuGet packages Microsoft.Bcl.*; not needed in .NET Standard project
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updated NuGet packages Newtonsoft.Json and System.Data.SQLite.Core to their latest versions
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updated version number from 3.1.1 to 4.0.0-beta1
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Commits on Jul 23, 2018

fixed appveyor build by using Visual Studio 2017 (default is 2015)
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