Fix assembly compilation

Support Index, Range, HashCode, Span and Memory

Fix Task TrySetResult method to set result before sending completed s…

…ignal

Full implementation of Activator and Task.ContinueWith, support Array…

….ConvertAll, LocalizableAttribute and nullable attributes

Extends String, Comparer, Array, Type and support BufferedStream

Use variant Action and Func, extend support of LINQ methods

Extend Array, create sorted collections and improve read-only collect…

…ions support

Fix and optimize Task

Support Contracts and WebRequest timeout, and fix ValueTask awaiters

Support LINQ expressions