Fix problem with unbound type parameters as extension targets #2129
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Fixes #2113. [edited]
We didn't handle unbound type parameters as an extension target, and this highlighted a previously known bug in our handling of instantiated types.
Rationalize
ElementTypeso that allElementTypes can do subtype checks. We also catch up with the latest changes to analyzer and avoid use oftype.name. I feel the type checking code is now easier to rationalize about and is more correct.