ssdm-13365: moved lib-file-download into proper folder

...e/java/ch/ethz/sis/filetransfer/DownloadClientConfig.java

...java/ch/ethz/sis/filetransfer/DownloadClientDownload.java

...urce/java/ch/ethz/sis/filetransfer/DownloadException.java

...ce/java/ch/ethz/sis/filetransfer/DownloadInputStream.java

...a/ch/ethz/sis/filetransfer/DownloadInputStreamReader.java

.../source/java/ch/ethz/sis/filetransfer/DownloadItemId.java

.../ethz/sis/filetransfer/DownloadItemNotFoundException.java

...ava/ch/ethz/sis/filetransfer/DownloadListenerAdapter.java

...ce/java/ch/ethz/sis/filetransfer/DownloadPreferences.java

...d/source/java/ch/ethz/sis/filetransfer/DownloadRange.java

.../source/java/ch/ethz/sis/filetransfer/DownloadServer.java

...e/java/ch/ethz/sis/filetransfer/DownloadServerConfig.java

...java/ch/ethz/sis/filetransfer/DownloadServerDownload.java

...source/java/ch/ethz/sis/filetransfer/DownloadSession.java

...urce/java/ch/ethz/sis/filetransfer/DownloadSessionId.java

...d/source/java/ch/ethz/sis/filetransfer/DownloadState.java

.../source/java/ch/ethz/sis/filetransfer/DownloadStatus.java

...ource/java/ch/ethz/sis/filetransfer/DownloadStreamId.java

...nload/source/java/ch/ethz/sis/filetransfer/FileChunk.java

...ava/ch/ethz/sis/filetransfer/FileSystemChunkProvider.java