Define "torrent ID" concept, which is either a SHA1 hash for torrents of version 1,
or a SHA256 hash (truncated to SHA1 hash length) for torrents of version 2.
Add support for native libtorrent2 info hashes.
Originally, it was just a wrapper for libtorrent::torrent_handle class, so it mimicked its name.
It was then transformed into a more complex aggregate, but the name was retained (just by inertia).
Unlike libtorrent::torrent_handle class in whose name "handle" means the pattern used,
it does not matter for qBittorrent classes and just eats up space in the source code.
The basic idea is we create a version header template at
"src/base/version.h.in" and the build systems are expected to replace
strings that are enclosed with @ symbols and generate
"src/base/version.h" for other source files to consume/include.
Move files/folders renaming functions to core classes.
Query file/folder for renaming by its current path.
Add ability to rename content folders from WebAPI/WebUI.
Fortunately, serializing to JSON limits the data types to a very small
subset and thus we are able to implement the comparison without much
hassle.
Fix up cba8d83b21.
Add option for setting lt::settings_pack::hashing_threads
introduced by libtorrent 2.0. It has no effect for earlier
libtorrent versions.
Use 10 async IO threads, as per #11461.
Closes#11461.
Don't hardcode lt::settings_pack::no_connect_privileged_ports. We
support the peer alert for it already, so connections blocked by this
setting should be logged.
This PR exposes the LibTorrent Peer Turnover Settings in qBT Advanced Settings in order to allow users to adjust how frequently slow and uninteresting connections are closed to allow potentially better / faster connections to be made.
The default settings are to turnover peers when the number of connections is at least 90% of allowed global or per torrent connections, and to disconnect the least attractive 4% of these connections every 5 minutes.
See https://www.libtorrent.org/reference-Settings.html#peer_turnover
