* refactor: tr_ctorSaveContents takes a string_view filename
* refactor: remove tr_ctorSaveMagnetContents
* refactor: announce_list::save takes a std::string_view
* refactor: magnet() takes an OutputIt arg
Generate the magnet link URL into an output iterator
* refactor: remove deprecated calls to tr_http_escape
* refactor: tr_torrent.torrentFile takes an OutputIterator
* refactor: tr_torrent.torrentFile returns a tr_pathbuf
* refactor: tr_torrent_metainfo.makeFilename returns a tr_pathbuf
* refactor: use tr_urlbuf in announcer-http
Add a getter/setter for torrent announce URLs as text that can be copied
and pasted: one URL per line, with a blank line between tiers.
C API: tr_torrentGetTrackerList() and tr_torrentSetTrackerList()
RPC APi: `trackerList` in `torrent-get` and `torrent-set`.
This deprecates `trackerAdd`, `trackerRemove`, and `trackerEdit`
from the RPC API.
* refactor: prefer constexpr over enum for GUI_PAD values
* refactor: prefer constexpr over enum for PrefsDialog values
* refactor: prefer constexpr over enum for StatsDialog values
* refactor: use enum class for GtrUnicode types
* refactor: prefer constexpr over enum for BT peer msg codes
* refactor: use enum class for TrMakemetaResult
* refactor: prefer constexpr over enum for BT metadata message types
* refactor: use enum class for AwaitingBt
* refactor: use enum class for EncryptionPreference
* refactor: use enum class for TrFormat in rpcimpl
* refactor: prefer constexpr over enum for QApp intervals
* refactor: prefer constexpr over enum for tr_resume bitfields
* refactor: prefer constexpr over enum for Qt/TrFileModel bitfields
* refactor: remove obsolete TODO comment in announce-list
* refactor: include <memory> when using shared_ptr or unique_ptr
* refactor: include <cstdio> iff we use it
* refactor: include <cstring> iff we use it
* refactor: include <cstdlib> iff we use it
* refactor: include <string_view> or <string> iff we use it
* refactor: include <array> iff we use it
* refactor: include <ctime> iff we use it
* refactor: include <cctype> iff we use it
* refactor: misc #include cleanups in libtransmission
