Ensure any specified filename is shortened to the maximum length supported by the OS

[ediweissmann]

org.sejda.model.exception.TaskOutputVisitException: Exception dispatching the file or directory task output.
	at org.sejda.model.output.FileOrDirectoryTaskOutput.accept(FileOrDirectoryTaskOutput.java:50)
	at org.sejda.impl.sambox.component.split.AbstractPdfSplitter.split(AbstractPdfSplitter.java:119)
	at org.sejda.impl.sambox.SplitByPageNumbersTask.execute(SplitByPageNumbersTask.java:76)
	at org.sejda.impl.sambox.SplitByPageNumbersTask.execute(SplitByPageNumbersTask.java:45)
	at org.sejda.core.service.DefaultTaskExecutionService.actualExecution(DefaultTaskExecutionService.java:148)
Caused by: java.nio.file.FileSystemException: /path/to/long/filename.pdf: File name too long
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:100)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	at java.base/sun.nio.fs.UnixCopyFile.copyFile(UnixCopyFile.java:246)
	at java.base/sun.nio.fs.UnixCopyFile.copy(UnixCopyFile.java:603)
	at java.base/sun.nio.fs.UnixFileSystemProvider.copy(UnixFileSystemProvider.java:257)
	at java.base/java.nio.file.Files.copy(Files.java:1305)
	at org.apache.commons.io.FileUtils.copyFile(FileUtils.java:811)
	at org.apache.commons.io.FileUtils.moveFile(FileUtils.java:2400)
	at org.apache.commons.io.FileUtils.moveFile(FileUtils.java:2374)
	at org.sejda.core.support.io.OutputWriterHelper.doMoveFile(OutputWriterHelper.java:167)
	at org.sejda.core.support.io.OutputWriterHelper.moveFile(OutputWriterHelper.java:146)
	at org.sejda.core.support.io.OutputWriterHelper.moveToDirectory(OutputWriterHelper.java:116)
	at org.sejda.core.support.io.DefaultMultipleOutputWriter.dispatch(DefaultMultipleOutputWriter.java:72)
	at org.sejda.model.output.FileOrDirectoryTaskOutput.accept(FileOrDirectoryTaskOutput.java:48)
	... 20 more