Add override for GdkPixbuf.Pixbuf.new_from_data. Fixes #225

Christoph Reiter requested to merge pixbuf-new-from-data into master

new_from_data isn't bindable (see and will result in use after free. While we could try to move people away from it and skip it in GI a github code search turns up quite a few users.

This adds an override for it, wrapping GdkPixbuf.Pixbuf.new_from_bytes, and marks any usage of the callback args as deprecated.

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