gi: Refactor resolving prototypes in GIWrapperInstance constructors

Evan Welshrequested to merge
ewlsh/refactor-prototype-resolution into master

Refactor GIWrapperInstance/Instance to take Prototype in the constructor.

This is needed for class-based instances where the JavaScript prototype is not the same as the native Prototype object.

Preparation for !700 (merged), !509 (closed)

Edited by Evan Welsh

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