[dev] Task::allowedScopes should be a static property

It's pointless to have it as instance variable
[new] Tweak the Task class' API to allow reading current Task configuration
[dev] Simplify naming of conversion methods
[dev] Simplify method call in Link::__construct()
[new] ObjectGUID is now displayed exactly as AD tools show it
[new] Allow the Converter to accept attribute names as strings instead of requiring an instance of Attribute class
[new] Include highestcommitedusn in Link::rootDSE entry by default
[new] objectGuid is now returned for all retrieved objects automatically
[dev] Fix typo, it's double T in highestcommittedusn
[new] Implemented method for tracking changes in Active Directory
Merge branch 'feature/pull_changes' into develop
[dev] Update README.md to reflect new features
[dev] Add CHANGELOG.md to track latest updates
[dev] Update dependencies to latest versions