APDS-627: Allow importing multiple language codes

[zoliMolnar]

• [rf2] Added tests for multi-language rf2 importer.

• [rf2] Changed description, languagerefset file property to collection.

• [rf2] Changed logic so it can work with collections.

• [rf2] Added test import rf2 archives

• [rf2] Added statusCode check for the concept id, renamed variables to match what they represent, members ids instead of concept ids

• [rf2] Changed data binding properties.

• [rf2] Changed loops to streams moved adding description and language refset files logic outside of loop

• [rf2] Merged the two test cases into one.

• [rf2] Changed logic of reading and writing of description files and language refset files for net4j indications.

• [rf2] Added final modifiers.

• [rf2] Fixed test import file changed language code and refset id.

• [rf2] Fixed typo.

• [rf2] Fixed conceptId of refset in the import file.

• [rf2] Added placeholder properties for databinding.

• [rf2] Added validation for definition text files, removed extra lines.

• [rf2] Added proper monitor progress. Added logic to write textDefinitionFiles

• [rf2] Added method to read collection of files and to monitor progress.

• [rf2] Removed extra line.

• [rf2] Removed extra line. Added logic to handle multiple text definition files.

• [rf2] Removed unneeded iteration.

• [rf2] Added logic to handle collection of text definition files.

• [rf2] Removed extra line.

• SO-2902: Simplify test case

• [snomed.import] Refactor ImportConfiguration

• remove unnecessary fields from import config

• refactored SnomedRefSetNameCollector:

  • do not parse description files for each refset URL, parse them only once
  • "prepare" resolvable refset labels for the client

• do not send language refset files twice over the wire

• [snomed.import] Fix cloning of stated relationship file

• SO-2902: Update license header

• SO-2902: Use Pattern.quote instead of Charmatcher.replace

• SO-2902: Use try-with-resource for description readers

• SO-2902: Fix NPE

Conflicts: snomed/com.b2international.snowowl.snomed.api.rest.tests/src/com/b2international/snowowl/snomed/api/rest/io/SnomedImportApiTest.java snomed/com.b2international.snowowl.snomed.importer.rf2/src/com/b2international/snowowl/snomed/importer/rf2/util/ImportUtil.java snomed/com.b2international.snowowl.snomed.importer.rf2/src/com/b2international/snowowl/snomed/importer/rf2/validation/SnomedValidationContext.java snomed/com.b2international.snowowl.snomed.importer/src/com/b2international/snowowl/snomed/importer/net4j/ImportConfiguration.java