RTorrent release version 0.10.0

Thanks to a 3rd party sponsoring development, and recent changes in my personal life, I've started actively developing rtorrent.

Some of the recent PR's merged include:

libtorrent

1. Significant performance improvements to improve throughput and reduce CPU usage.
2. A fix for a torrent client crash with the socket address object.
3. Support for 33 gigabit speed throttles on ruTorrent.

rTorrent

1. A fix for a torrent client stack overflow crash with the lockfile buffer.
2. New trackers.delay_scrape command for .rtorrent.rc to avoid crashes with thousands of torrents and allow instant startups.
3. A fix for compiling the software with LTO (Link Time Optimizations) for additional performance.
4. A fix for a critical memory leak with RPC commands which may waste an alarming amount of memory.
5. A fix for critical torrent client breakage if a power outage/failure occurs during a session saving interval.

Please consider donating (https://rakshasa.github.io/rtorrent/donate.html) to help fund the development of this client.