* Do not remove torrent if trashing files failed.
Instead, stop the torrent and sets an error.
* Fixing GTK interface with new file removal behavior.
* C++17 compliant.
* Reverting unrelated change.
* Avoiding allocating unecessary objects.
* Easy review fixes.
* Fixing merge error.
* Adding result callback to tr_torrentRemove().
Using the new callback in Gtk GUI to decide when to remove it from the
interface.
* Reducing indentation level and making the function more readable.
* Using existing Session RefPtr.
* Notifying the client before freeing the torrent in the session.
* Addressing comments and synchronizing callback.
* Moving include.
* Fix constness issue reported by clang-tidy
9fc9daf40d