GetEntitiesById should maintain sort order based on IDs past in

[mattbrailsford]

When using the entity picker prop editor, the results are being returned sorted by the sort field, rather than the picked order.

This ultimately comes down to the fact it calls GetEntitiesById which in turn calls GetPaged on the entity repository with a null sort expression. Because of this, the GetPaged method automatically generates a sort expression based on the configured sort property. We should probably make it so that calls to GetEntitiesById maintain the ID sort order.

[ronaldbarendse]

Maintaining the passed in order is quite easy, as you'd just have to sort on the index of the IDs, e.g. entities.OrderBy(e => ids.IndexOf(e.Id)).ToList();