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

lib-file-download/build.gradle

lib-file-download/gradle/wrapper/gradle-wrapper.jar

lib-file-download/gradle/wrapper/gradle-wrapper.properties

lib-file-download/gradlew

lib-file-download/gradlew.bat

lib-file-download/javaproject.gradle

lib-file-download/repository.gradle

lib-file-download/settings.gradle

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

...load/source/java/ch/ethz/sis/filetransfer/AbstractId.java

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

...-download/source/java/ch/ethz/sis/filetransfer/Chunk.java

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

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

...va/ch/ethz/sis/filetransfer/DefaultChunkDeserializer.java

...java/ch/ethz/sis/filetransfer/DefaultChunkSerializer.java

...ch/ethz/sis/filetransfer/DefaultDeserializerProvider.java

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

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

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