[TASK] Adjust labels
[TASK] Update README file
[TASK] Update vendor name in namespace to be Vanilla\Messenger
[TASK] Use class alias and rename validator to be EmailValidator
[TASK] Convert class alias
[TASK] Rename class to become ObjectUtility
[FEATURE] Add "to", "cc" and "bcc"

The patch also deprecate the "recipients" property.
[FEATURE] Improve implementation of Crawler
[FEATURE] Better implementation of method Message->toArray
[FEATURE] Add generic show widget for representing an object