Change 14220
-Added binary tree implementation (red/black tree) with same multi-key interface as hashmap
-Renamed AccessorGroup to MapAccessorGroup to make room for TreeAccessorGroup, which is a lot of duplicated code but had to meet some specific requirements that couldn't be easily fit into the existing AccessorGroup
-Fixed HashMap::Clear() not resetting size to 0
-Fixed HashMap::Erase() neither decrementing size nor freeing memory
-Changed HashMap to grow before insert instead of after (delaying needed growth until the next insert instead of growing when it detects the next insert will need it)
-Fixed a style issue for private function HashMap_Impl::insertHere_()
-Fully removed support for Visual Studio 2012 as I have neither the need nor the desire to continue supporting it. The doubled maintenance cost is too high.
-Included array unit test that got missed before
#review-14221
-Renamed AccessorGroup to MapAccessorGroup to make room for TreeAccessorGroup, which is a lot of duplicated code but had to meet some specific requirements that couldn't be easily fit into the existing AccessorGroup
-Fixed HashMap::Clear() not resetting size to 0
-Fixed HashMap::Erase() neither decrementing size nor freeing memory
-Changed HashMap to grow before insert instead of after (delaying needed growth until the next insert instead of growing when it detects the next insert will need it)
-Fixed a style issue for private function HashMap_Impl::insertHere_()
-Fully removed support for Visual Studio 2012 as I have neither the need nor the desire to continue supporting it. The doubled maintenance cost is too high.
-Included array unit test that got missed before
#review-14221
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