* refactor: move tr_tracker_http_announce() helper funcs into their own namespace
* refactor: move tr_globalIPv6() helper funcs into their own namespace
* refactor: move tr_address_is_valid_for_peers() helper funcs into their own namespace
* refactor: make tr_address_compare() a private method
* refactor: rename tr_address::isIPv4() to is_ipv4()
* refactor: use snake_case for tr_address methods
* refactor: make tr_address_is_valid_for_peers() a member function
* refactor: make tr_peer_socket.type private
* refactor: reimplement tr_peerIo::address() as a wrapper around tr_peer_socket::address()
* refactor: remove tr_address, tr_port from tr_peerIo
* refactor: replace tr_netClosePeerSocket() with tr_peer_socket::close()
* fix: save log level, encryption mod, preallocation mode as ints
* fix: ensure log level is saved in tr_sessionGetSettings()
* fix: ensure the right verbosity row is selected
* refactor: make tr_session.private_peer_port a private field
chore: make tr_session.public_peer_port a private field
* refactor: make tr_session.web_ a private field
* refactor: make tr_session.lpd_ a private field
* refactor: make tr_session.bind_ipv4_ private
refactor: make tr_session.bind_ipv6_ private
* refactor: make tr_session.bandwidth_groups_ private; add const accessor
* refactor: make tr_session.port_forwarding_ private
* refactor: make tr_session.peerMgr private pt 1: add tr_session::addIncoming()
* refactor: make tr_session.peerMgr private pt 1: add tr_session::addTorrent()
* refactor: make tr_session.peer_mgr_ private
* refactor: make tr_session.setPeerPort() private
* chore: move private tr_session struct declaration to beginning of class
* chore: move all tr_session fields into the same code section
* chore: move private constexpr, const fields before mutable ones
* chore: move trivial fields before nontrivial fields
* chore: reconcile with refactor/session-const-fields-first
* refactor: add a Mediator class to decouple tr_session and tr_port_forwarding
* refactor: add tr_port_forwarding::Mediator::privatePeerPort()
* refactor: add tr_port_forwarding::Mediator::onPortForwarded()
* chore: avoid unnecessary include of timer.h in other headers
* refactor: use a uniform timerMaker() API in mediators
* refactor: rename state enum type as tr_port_forwarding_state
* chore: use snake_case for tr_shared struct fields
* refactor: replace tr_shared with tr_port_forwarding
* refactor: make tr_natpmp_state an enum class
* refactor: uniform naming for port-forwarding module
* refactor: move output-only parameters in tr_natpmp::pulse() to return struct
* fix: use a nullptr multicastif if bindaddr is empty
* chore: use PascalCase for enum class values
* chore: clean up port-forwarding #includes
* chore: remove unused tr_port_forwarding::peerPort()
* chore: use typesafe sin_addr assignment instead of memcpy()
* refactor: make tr_dhtPrintableStatus private
* refactor: make tr_dhtStatus() private
* refactor: make tr_dht status enum private
* refactor: add safety mutex wrapper around libdht API calls
* refactor: make tr_dht::Status an enum class
* refactor: rename private functions
* refactor: const correctness
* refactor: use typesafe assignment instead of memcpy
* refactor: tr_session does not directly call tr_dht
* refactor: tr_dhtPort() returns std::optional
* refactor: use tr_address::fromCompact4 in tr-dht.cc
* Use std::unique_ptr to manage UDP core object
N.B.: it's no longer valid to call socket adjustments quirks from
tr_sessionSetUTPEnabled() because the corresponding object may be
not created yet. We have to create (or re-create) it explicitly
(like it's done in tr_sessionSetDHTEnabled()) or just set
is_utp_enabled_ flag of the session and assume that socket
adjustments will be done later when the object is constructed.
