DownloadFileAction (and maybe other places?) doesn't use a timeout for downloads, causing downloads to hang if a server doesn't respond

[Barteks2x]

One case of this is also in FileUtils.getFileSize - by default there is no timeout.

Normally this works because you either get a response or it fails. But sometimes, in some random cases of network issues, there is no response at all and it will hang, waiting forever for a nonexistent response.

This also applies to NG6, in different part of the code.