* Revert "feat: save queue order between sessions (#6753)"
This reverts commit 4db50dae10.
* refactor: new torrent queue class
* refactor: replace queue code with new class
* test: new tests for new class
* feat: store and load queue order across sessions
* build: xcode
* refactor: use set_difference instead of unordered_set
* code review: use `tr_torrent_id_t` as key
* fix: don't overflow when moving up/down
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Co-authored-by: Dzmitry Neviadomski <nevack.d@gmail.com>
