0.2.2-preview Release

[MikeStall]

Many improvements, including:

1. Updates namespaces (see Fixup namespace for publics.  #361) - this is a breaking change from 0.2.1-preview.
2. More control over configuration and adding custom functions and optionsets.
3. publicly expose the syntax tree from the parser.
4. More functions implemented in interpreter.
5. Better config story for adding custom functions
6. Better host marshalling, including add virtual RecordValues and ITypeMarshallers for marshalling .net objects.
7. OptionSet support
8. Improved error handling.
9. DisplayName support
10. ParseJson support.

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This discussion was created from the release 0.2.2-preview Release .

[MikeStall]

Samples at https://github.com/microsoft/power-fx-host-samples are also updated to be on 2.2-preview.

[MikeStall]

This is available at nuget.org at:
https://www.nuget.org/packages/Microsoft.PowerFx.Interpreter/0.2.2-preview

We're still producing daily nugets (see https://github.com/microsoft/Power-Fx#daily-builds), but those aren't on nuget.org.