- #3215
- add new accessor properties to `IModelBindingMessageProvider` and plumb them through
- use in `ModelStateDictionary` when handling a `FormatException` or `OverflowException`
- use in `ValidationHelpers` when handling a `ModelError` with `null` `ErrorMessage`
- add new `ModelExplorer` parameter to `IHtmlGenerator.GenerateValidationMessage()`
- plumb through to `ValidationHelpers.GetModelErrorMessageOrDefault()`
Started from work @kichalla did on the `kiran/movemessages-to-messageprovider` branch in #3775.
nits:
- use helper methods more consistently in `HtmlHelper<T>`; slightly improves error checking
- remove unused `Resources` class from `Microsoft.AspNet.Mvc`
- make `ValidationHelpers` class `public`; already in `.Internal` namespace
- split `GetUserErrorMessageOrDefault()` in two; rename to `GetModelErrorMessageOrDefault()`
- fix some #YOLO wrapping
04453a2b4f