Used Array.Empty

Removed Empty, NonEmpty, One operators

Added IfNonEmpty, StackOf, ConsOf; Removed DictOf(A, B, A, B....)

Removed Sum operator

Added Deconstruct to Cons

Added Deconstruct to Maybe

Added First2, First3, ContainsAny, ContainsAll; Removed IsNotIn

Added Clump, Couple, Triple, Transpose, AggregateDisposable; Removed OverlappingPairs

Added AsyncQueue

IFileSystem extensions are now default methods on interface

Added FastInverseSqrt and FastSqrt

Added Memo() for 0-arg Func

Fixed travis script

Moved solution file to top level

Fixed security issue with Operators.Basic.Clone