Add Runtime.SetGlobalObject() method. #654
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See #653 (comment).
I'm not sure if there should be more to go along with this, this bare minimum function makes sense in the above Proxy example, but if you're actually setting it to a new object rather than Proxying the old global, all the built-ins will be missing from the global scope. Maybe that is desirable in some situations, but maybe another function to initialize a "default" global object makes sense as well?
I added tests for all the cases that seemed notable, things like variables being defined/undefined in old/new global, and checking references to the old global in the new global scope. I also included a test for the original Proxy example to make sure it worked as expected.