Add swisstable header as fast hashmap alternative #270
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Description
This adds google's cwisstable hashmap impl to the codebase. For now it's separate (and will be used in r2), but we should really consider using this hashmap as the foundation of Ht* hashmaps in sdb. This will save a significant amount of CPU cycles and has a much lower memory footprint.
NOTE: Windows support is not complete yet, but should be relatively easy to make it compile there too.