[ruby] Class & Singleton Class Modelling

[DavidBakerEffendi]

Ruby, similar to Python, has the notion of a "meta-class" called the singleton class. This can be seen in methods such as def self.foo;end and def foo;end where the former is defined against the singleton. Similarly in fields, where @@ fields are defined against the singleton class.

When instantiating classes, Foo.new is a call to the singleton class that allocates memory and calls the respective class' initialize method.

To model this, we need:

1. To create classes and modules in pairs, where one is Foo (the "regular" class) and the other is Foo<class> (the singleton class)
2. Define members for @@ fields under Foo<class>
3. Define members with dynamicTypeHintFullNames set to the corresponding self methods and under Foo<class>. Foo<class> should have empty bindings to these self methods. An empty binding is one with name=="" and signature==""
4. During object instantiations, e.g. Foo.new, add Foo<class> to the receiver's dynamic type hints, and Foo as the return type of Call(new). The call linker may add an edge directly from Foo.new to Foo.initialize.
5. Figure out Ruby field instantiation method names, similar to Java's <clinit> and use more Ruby-specific names for the constructor cycle.