Improves the serialization for more complex objects.

In it's current state, we correctly serialize simple attributes in an object:

class CustomObject:
    def __init__():
        self.attr1 = "a"
        self.attr2 = ["b", True]

This PR also adds support for:

1. Properties (methods denoted with @property)
2. Iterators (which are automatically iterated on, i.e. converted to a list)
3. Enums (which now serialize the value itself, instead of whatever the result of str(enum) returns

Testing

I've tried this out with our own emulator and tried to convert various (complex) objects, and have encountered no problems.