Merge branch 'en/merge-ort-3'

Rename detection is added to the "ORT" merge strategy. * en/merge-ort-3: merge-ort: add implementation of type-changed rename handling merge-ort: add implementation of normal rename handling merge-ort: add implementation of rename collisions merge-ort: add implementation of rename/delete conflicts merge-ort: add implementation of both sides renaming differently merge-ort: add implementation of both sides renaming identically merge-ort: add basic outline for process_renames() merge-ort: implement compare_pairs() and collect_renames() merge-ort: implement detect_regular_renames() merge-ort: add initial outline for basic rename detection merge-ort: add basic data structures for handling renames