Changeset 10861:4a178c069ce3
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base: add generic bitset class that can be sized dynamically

The difference between this class and std::bitset/VectorMask is that the
bitset is sized dynamically (you don't need to know at compile time how
many bits are in the bitset). This is like the template specialization for
std::vector<bool>, but with some extra functionality to test/set membership
in ranges, etc.