Refactored constructor functions; GameObject, CharacterStats, Humanoid,
Villain and Hero to ES6 classes using keywords; `class`, `extends` and
`super`.

Wrote Person class with properties; name, age, gender and location,
and has method; speak().

Wrote Instructor class that inherits from the Person generic class
and has extra properties of; specialty, favLanguage and catchPhrase,
and also has methods named; demo(subject) and grade(student, subject).

Wrote Student class that inherits form the Person class, with unique
properties; previousBackground, className and favSubjects, and unique
methods; listsSubjects(), PRAssignment(subject) and sprintChallenge(
subject).

Wrote ProjectManager class that extends the Instructor class, with
unique properties; gradClassName, favInstructor and unique methods;
standUp(channel) and debugsCode(student, subject).

Extend the functionality of the Student adding grade property and
graduate() method. Also, add gradeStudent() method to the Instructor.

WEBEU2 - JavaScript IV - James Eneh 🇳🇬