Get __class__ keyword works without AST modification

[in-code-i-trust]

Hi, this resolves #723.
As the subject says, the AST modification (introduced in #721) has been removed.

Changes are...

1. Reverted Get super() and __class__ works in non-global context. #721
2. Introduced GetGrandParentContextFromFunction() to make __class__ handling code works. c.f.) FunctionDefinition.cs
3. Imported test from __class__ is replaced with the name of the class in the AST #723

[slozier]

Thanks for the PR. There seems to be some sort of binding issue. For whatever reason the following example returns the function instead of the class.

class test(object):
    def test(self):
        def test2():
          return __class__
        return test2()

assert test().test() == test

[slozier]

Maybe drop the _maybegrandparent field and use an auto-implemented property?

internal CodeContext GrandParentContext { get; }

[slozier]

Is this a concept that should be exposed publicly? Maybe add an internal constructor overload instead?

[slozier]

Thanks for the PR! Closing this since the issue has been resolved by #1087