This is wrong place to fix the issue, it's just a workaround for broken rtt calculation
Revert "Add support for immediate resending of oldest reliable packet on hitting send window border"

This reverts commit a866e4b8e3e6e02d37be4c2ee5107d55e5720325.
Fix rtt calculation
Fix and improve per channel bandwidth calculation
Fix invalid assertion on processing reliable data
Add debug feature to show per peer bandwidth statistics each 20 seconds