(backends) Create new class: OrccFilesManager

Written in Xtend, the goal is to group all methods whose already exists
to manipulate files, and remove them from CommonPrinter, AbstractBackend,
OrccUtil, etc.
(backends) Add some tests for FilesManager class
(tests) Rename Test class for OrccFilesManager
(filesManager) Fix line ending issues with extract()
(filemanager) Improve doc + minor fixes
(filesManager) Implements full folder extraction

Only valid for folders stored on the disk (not in a jar file)
(filesManager) Fix extraction from basic bundle (not jar file)
(tests) Add more tests for folder extraction
(tests) Add test for file extraction from jar
(filesManager) Add an OS detection

Need to be fixed for Mac OS
(filesManager) Fix file path sanitization method
(filesManager) Add URL computation routine
(tests) Add a jar to the classpath
(tests) More test on folder extraction from a jar
(filesManager) Add support for file extraction from a jar
(filesManager) Support folder extraction from jar
(tests) Re-organize filesManager tests
(filesUtil) Merge some methods, improve doc
(filesManager) Improve method to compare 2 contents
(filesManager) Implements cache feature and Object oriented results