3.0.0-beta2

fix: Replace deprecated call with explicit factory call.
Refactor unserialize calls to use _unserializeState
Add VERSION_SIXTEENONE constant for version 16.1
Merge pull request #22 from horde/feat/EAS_version_handling_per_user_or_device
refactor: Remove the extra logic - this is now handled in Horde_Core_ActiveSync_Driver->getUser() directly.
refactor: See also horde/Core#75 - Keep the horde specific stuff in core and apps
chore(hordeyml): Add keywords for packagist
style: php-cs-fixer
fix: #23 PHP 8.4 deprecation of implicit nullable type
Resolve user for device handling in ActiveSync
Merge pull request #21 from horde/feat/issue-core-67-modern-serialization
chore(hordeyml): Update autoloader rules
test: Modernize test suite (2 remaining test failures)
fix: serialization version upgrade
test: cover serialization issues
fix: Same version bug mentioned by @amulet1, probably fixed in his commits I cannot read.
fix: Version bug mentioned by @amulet1 in review
fix(activesync): Missing property declarations to Exporter/Base
feat(activesync): add modern __serialize()/__unserialize() methods to Folder classes