New features:
- If TLSF can't service an allocation made on it, and it's initialized with `new_pool_size` > 0, it will ask the backing allocator for additional memory.
- `estimate_pool_size` can tell you what size your initial (and `new_pool_size`) ought to be if you want to make `count` allocations of `size` and `alignment`, or in its other form, how much backing memory is needed for `count` allocations of `type` and its corresponding size and alignment.
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