Separates the MMP into two phases:
1). Creation of the ModelMetadata, discovery of properties and attributes
(reflection) is part of the MMP
2). Lookup of details based on attributes is now part of another phase,
and has its results cached.
Users can now implements and register an IFooMetadataProvider to customize
a single aspect of metadata (see how data annotations does it).
- includes new `RazorPage<TModel>.CreateModelExpression<TValue>()` method
- #1240
nit:
- regenerating the resources reordered Microsoft.AspNet.Mvc.Core's Resources.designer.cs
Kirthi Krishnamraju
N. Taylor Mullen
Ajay Bhargav Baaskaran
Ryan Nowak
Doug Bunting