This is based off of PR#1526 by azy5030 to add in: Torrent Web, BiglyBT, and FrostWire. I made the additional change requested by livings124.
In addition this also adds support for: HTTP Seed, aria2 (#532), and BitLord.
* refactor: keep torrent hash in std::array<char,20>
This replaces the hashString QString allocation with a compile-time
array that's included in sizeof the Torrent struct that owns it.
Mark Deepwell