1.4.0

Added

• Implemented Quicksort.
• Implemented BubbleSort.
• Implemented BuiltInSortingAlgorithmType to enumerate the sorting algorithms built into the library, including access to each algorithm's erased metatype.
• Implemented minimum, maximum, and average number-of-comparisons calculations for all sorting algorithms.
• Implemented isFinished property on sorting algorithms.
• Made Element the primary associated type of SortingAlgorithm.

Changed

• Made the number-of-comparisons calculations return Double instead of Int.
• Made Comparison.callAsFunction() answer ties with the left side, which preserves the stability of stable sorting algorithms.

Fixed

• Fixed the average number-of-comparisons calculations for InsertionSort and MergeSort, and the minimum for Quicksort, to be exact.
• Fixed a crash when sorting an empty input with Quicksort.
• Fixed a crash when peeking at an element in MergeSort right before the algorithm is finished.
• Fixed answer(_:) and peekAtElement(for:) to have no effect when the algorithm is not at a point of comparison.