Merge branch 'cs/#6129-is_null-removal'

Close #6129
change docblocks and comments that still using "Zend_" to "Zend\"
fix trailing_spaces
@var fix
fix @throws docblock
Merge branch 'cs/#6130-Zend_-classnames-replacement'

Close #6130
Fix undefined classes in phpDoc
Fix undefined class constant
Fix possible undefined methods in inherited classes
#6094 - changing boolean -> bool as of @samsonasik's suggestion (see #3342)
#6094 - removing unused `null` default property value
Merge branch 'hotfix/#6094-undefined-symbols-fixes'

Close #6094
Merge pull request #5857 from samsonasik/validator-db

Fixes #4521
[#5857] Better logic for resetting select

- Reset the select object whenever any of the various setters are called that
  could modify the behavior of the select.
Merge branch 'hotfix/5857'

close #5857
fixes #4521
Merge pull request #5970 from asgrim/adds-disableInArrayValidator-to-radio-element

Adds disableInArrayValidator check to Radio
Merge branch 'hotfix/5970'

Close #5970
Merge pull request #5997 from Martin-P/issue-5965

Update segment route to TranslatorInterface
Merge branch 'hotfix/5997'

Close #5997
Fixes #5965
Merge pull request #6009 from tommyseus/master

Form\Element\Select multiple is always required