Make mrc_call_python_function work for calling methods in the same class.

[lizlooney]

Currently mrc_call_python_function assumes that the function being called is outside of the current class/module. It needs to be updated so it can call a method that is defined in the same class.

[lizlooney]

Calling a method in the same class looks different in different languages. How should it look in blocks?

In python, it looks like this:
self.my_method(1, 2, 3)

In java, it looks like this:
my_method(1, 2, 3);

In C++, it looks like this:

In typescript/javascript, it looks like this:
this.my_method(1, 2, 3);

What should it look like in blocks?

This would be similar to python, but the "self." part might be confusing to the user.

Would this better?

[alan412]

Hmmm. I could go either way. Can we have the "self" not be editable? (As an aside, we should make non-editable blocks look obviously different)

The advantage of having "self" is that it makes for an easier transition from blocks to python.

The disadvantage is it looks more confusing....