fix AssemblyFileVersion
lower contract warning level of Test project
fix some Contract warining
add NotifyCollectionChangedEventObject and CollectionStatuses.EventsAsEventObject
remove not needed codes in CollectionStatuses
now (Slim)?CombineProducer result type does not have to be event
add  AnonymousEventObjectCollectionStatuses
fix InvalidInformationExceptionType
improve and fix DelegationCollectionStatuses
add BasicCombineProducer2
InitialState/Reset items of simple Events are no longer Tagged
integrate combining Producers
classes that handle Tagged collection now not handle Tagged
add (ReadOnly)TaggedCollection
add NotifyCollectionChangedEventObject.InitialStateItems and .ResetItems
fix csproj files
add SequenceEqual