* replace bencode calls in http response with static generated values
* move bytepool to shared folder
* change receivers for `Scrapes` and `RequestAddresses` (bored of compile warnings)
Might be used when tracker is behind reverse proxy and one of provided
addresses in `real_ip_header` is private/local address.
Additional changes:
* check if provided address is not multicast/broadcast
* configure `http.Server.ReadHeaderTimeout` with `http.ReadTimeout` to mitigate Slowloris
* update dependencies
* minor docs fixes
* add multiple addresses in request structures and frontend parsers
* move per-ip peer fetch/store from storage to internal hooks
* fetch/store both v1 and v2 info hashes
