dont resize in emplace when not necessary #100
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…ert occurs This required a few refactorings. Most importantly, a newly constructed map now allocates an empty bucket array. This might cause slowdowns when you create lots of maps without ever inserting anything. The advantage is that try_emplace should have the same speed, or even be a bit faster; especially when no insertion happens.
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Fixes #98. This changes the behavior of unordered_dense:
operator[], ortry_emplacedoesn't increase size when the element is found. Basically I had to shift anifto another place, so performance wise there shouldn't be much of a difference. Maybe it's even faster.