Copy from:
- some `static` `ModelMetadata` methods -> `ExpressionMetadataProvider`
- `TryGetValueDelegate` -> `TryGetValueDelegate`
- `TypeHelpers.CreateTryGetValueDelegate()`, related bits -> `TryGetValueProvider`
- `ViewDataDictionary.ViewDataEvaluator` inner class -> `ViewDataEvaluator`
- `ViewDataInfo` -> `ViewDataInfo`
- `ViewDataDictionary.Eval()`, related bits -> add to `ViewDataDictionary`
Change to fit in new world:
- usual stuff: `var`, `[NotNull]`, String -> string, namespaces, etc.
- PropertyDescriptor -> PropertyInfo
- update Reflection use
- no `IModelMetadata.Container` property
- improve a couple of variable and parameter names
- make `ViewDataInfo` immutable
- make `ViewDataDictionary.FormatValueInternal` `public` and -> `FormatValue`
- remove `[SuppressMessage]` attributes
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