fix(BaseException): Change to interface implements instead of class extends

[Bogatinov]

Error from lib.d.ts is interface and does not need super()

Interface requires for these to be implemented

name:string
message:string

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[Bogatinov]

CLA

I signed it!

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[jeffbcross]

The typescript version being used in this project does treat Error as a class, it's installed from @alexeagle's fork with a branch specifically for that purpose: "alexeagle/TypeScript#error_is_class" in package.json.

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