2.2.0 Release

[nblumhardt]

• This adds netstandard2.0 as a target framework #54 - add .NET Standard 2.0 target
• Support for using vscode. Support for building on non-Windows platforms. #63 - solution build support for non-Windows platforms, VSCode configuration
• Fixes #76, incorrect remainder used when Many() backtracks #78 - fixes Many with partial match consumes to much of the input #76, incorrect remainder reported when Many() backtracks
• Fix TextSpan.Equals() so that reference equality and length are considered #66 - fixes TextSpan.Until Behaviour #65, incorrect TextSpan.Until() calculation
• Reuse ArrayEnumerable.Concat in Result.CombineEmpty #69 - refactoring for use of ArrayEnumerable.Concat()
• Fix numeric parsers to accept Latin script digits only #70 - limit numeric parsers that detect ASCII digits to support Latin characters only
• Quick fix for #74 - incorrect class name in error message #77 - fixes Wrong class name in error message #74, incorrect class name in error message
• added character literal translation for the unicode space category #67 - use names for unprintable Unicode/ASCII characters