Implement automatic transfer cancelation #337
Merged
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This PR adds the automatic cancelation feature. This is done by checking on each file reaching any terminal state to see if there's any file not yet in the terminal state. If there isn't, the transfer is automatically canceled by the peer who receives the notification about the file state change.
Additionally, I've implemented a check upon establishing the connection to see if the transfer should be canceled based on file states to account for transfers created by old libdrop versions and to be double sure the mechanism works.