EZP-20321: Added IOServiceTest and fixed IOService
EZP-20321: Started refactoring IOHandler tests
EZP-20321: Handlers cleanup
EZP-20321: Refactored MimeTypeDetector
EZP-20321: Refactored MimeType in IOService & handlers
EZP-20321: CS
EZP-20321: IOHandler tests
EZP-20321: Legacy IOHandler tests
EZP-20321: Fixed IO\Handler\Legacy + tests