Fix sorted map always using insertion order when created as mutable#70

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AreeseDT wants to merge 4 commits intofrptools:masterfrom

AreeseDT:master

Commits on May 16, 2019

Pass compare function to sorted map when calling empty using mutable overload.
Adam Reese
committed

Commits on May 21, 2019

Fix error building RedBlackTree
Adam Reese
committed
Fix error building map
Adam Reese
committed

Commits on Jul 28, 2021

Add test for sorted map to ensure added items are sorted.
AreeseDT
committed