Set current/original values directly from dictionary

[ajcvickers]

Currently original/current values can be set from an object (entity or DTO) or from another PropertyValues object (e.g. set OriginalValues to CurrentValues).

@AndriySvyryd Suggested it would be good to be able to set from an IDictionary<string, object>.

This is the code you would write today to do this:

var currentValues = context.Entry(building).CurrentValues;
foreach (var property in currentValues.Properties)
{
    currentValues[property] = dictionary[property.Name];
}

Or if some properties may not be in the dictionary (e.g. shadow properties):

var currentValues = context.Entry(building).CurrentValues;
foreach (var keyValue in dictionary)
{
    currentValues[keyValue.Key] = keyValue.Value;
}

With the suggested API the code would be:

context.Entry(building).CurrentValues.SetValues(dictionary);