Move ToStringComparator and UnicodeUtils to string package.

...ce/java/ch/systemsx/cisd/common/parser/TabFileLoader.java

...va/ch/systemsx/cisd/common/string/ToStringComparator.java

...rce/java/ch/systemsx/cisd/common/string/UnicodeUtils.java

...ityregistration/SampleAndDataSetControlFileProcessor.java

...egistration/SampleDataSetPairParserObjectFactoryTest.java

...penbis/generic/client/web/server/CommonClientService.java

...s/generic/client/web/server/FileExportServiceServlet.java

...temsx/cisd/openbis/generic/shared/parser/FileSection.java

.../cisd/openbis/generic/shared/parser/NamedInputStream.java

...eapitest/api/v1/GeneralInformationServiceJsonApiTest.java

...systemtest/plugin/generic/ExperimentRegistrationTest.java

...openbis/systemtest/plugin/generic/SampleBrowsingTest.java

...nt/web/server/library_tools/LibraryEntityRegistrator.java

...web/server/library_tools/ScreeningLibraryTransformer.java