Refactor thing names by just renaming them

[benjohnbarnes]

I so often want this in IDEs.

The compiler knows that all these different uses of myDudeX are the same thing. So if I change any of them to mySuperDudesX, they could all update.

There's probably more to this than I expect, such as disconnecting a particular name to fix a bug or make a change, or what happens if you change a name to an existing name, or the empty string…