HORNET-0.2.7

Added

- Version printout `--version`

Changed

- WorkerPools don't get flushed at shutdown by default
- Import spent addresses in smaller batches
- Faster syncing

Fixed

- RequestQueue never got empty if the cache overflowed
- Several shutdown problems
- Issue were only tail tx of a bundle got confirmed
- Status report was still active during shutdown
- Future cone solidifier got stuck, causing the node to become unsync