Class Inheritance, Composition and Extension

[KCreate]

This builds on top of this issue. Syntax for composing different classes together to form a new one is as follows:

class Person {};
class SuperPowers {};
class TheFlash(Person, SuperPowers) {};

This just executes Person, SuperPower and TheFlash (in this order) in a shared stack.

To extend a class you write

class Person {};
class Person(Person) {};

Note that you have to be in the same scope as where the class was defined, as class definitions are block-scoped.

[KCreate]

Closed via #88