2.53.0

1. New congestion control algorithm for streaming
2. Set minimal router version to 0.9.59 for floodfills and 0.9.58 for client tunnels
3. Recognize duplicated routers and bypass them
4. Fixed crash when a destination gets terminated
5. Update router's congestion caps before initial publishing
6. Removed openssl 1.0.2 support
7. Don't request relay tag for every session if enough introducers
8. Update LeaseSet if inbound tunnel failed
9. Select newest introducers to publish
10. Fixed race condition between local RouterInfo buffer creation and sending it through the transports
11. Don't create local destination with expired offline keys
12. Limit stream's outbound speed
13. Update timestamp for non-reachable or hidden router
14. Random SSU2 resend interval
15. Reset streaming routing path if duplicated SYN received