Fix unused imports
Remove unused variables
Add test case for constructor method
Merge branch 'hotfix/#6093-dead-code-cleanups'

Close #6093
fixed typos
Merge branch 'hotfix/#6116-typo-fixes'

Close #6116
Zend\Filter\Compress\Tar::setMode() should work with case-insensitive - fix #6102
fix for CS at tests/ZendTest/Filter/Compress/TarTest.php
Merge branch 'hotfix/#6103-#6102-tar-compress-filter-mode-case-insensitive'

Close #6103 #6102