Integrated Pipeline: renamed message case classes

...rc/main/scala/eu/nomad_lab/integrated_pipeline/Main.scala

...ad_lab/integrated_pipeline/messages/FileParsingTask.scala

...lab/integrated_pipeline/messages/FileTreeScanResult.scala

...d_lab/integrated_pipeline/messages/FileTreeScanTask.scala

...pipeline/stream_components/CalculationParsingEngine.scala

...eam_components/DirectoryTreeParsingRequestGenerator.scala

..._pipeline/stream_components/ParsingRequestGenerator.scala

...tegrated_pipeline/stream_components/TreeParserGraph.scala

...ne/stream_components/ZipTreeParsingRequestGenerator.scala

...egrated_pipeline_tests/CalculationParsingEngineSpec.scala

...scala/integrated_pipeline_tests/TreeParserGraphSpec.scala

...ated_pipeline_tests/TreeParsingRequestGeneratorSpec.scala

...ne/src/test/scala/integrated_pipeline_tests/package.scala