Closing XIVLauncher during download does not cancel download

[Velkee]

If XIVLauncher.Core is launched and the client starts a patch download, the download will continue to run in the background when you close the application window. XIVLauncher.Core appears to continue to run in the background, and sending a sigterm through my system monitor was the only option to truly stop the process.

It appears the XIVLauncher.Core download process does not use the XIVLauncher.Core process name, as is seemed the download continued even after terminating the process.

[Blooym]

This should be resolved with #192