Move surface handling from wlr_output_cursor to wlr_cursor
Same as !3579 (closed), but doesn't touch public APIs and doesn't attempt to grab the source buffer from the wlr_client_buffer.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Same as !3579 (closed), but doesn't touch public APIs and doesn't attempt to grab the source buffer from the wlr_client_buffer.