Single file transfers (#56)

* move to single file transfer and extraction per server download

* clean up downloads

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Co-authored-by: rootdarkarchon <root.darkarchon@outlook.com>

MareSynchronos/PlayerData/Handlers/PairHandler.cs

@@ -59,6 +59,7 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
         Mediator.Subscribe<FrameworkUpdateMessage>(this, (_) => FrameworkUpdate());
         Mediator.Subscribe<ZoneSwitchStartMessage>(this, (_) =>
         {
+            _downloadCancellationTokenSource?.CancelDispose();
             MediatorUnsubscribeFromCharacterChanged();
             _charaHandler?.Invalidate();
             IsVisible = false;