merge-ort: some groundwork for further implementation

This series is based on en/merge-ort-impl. This series sets up three future patch series (to add recursive merges, three-way content merging, and rename detection) for the merge-ort implementation, and allows the future series to be submitted, reviewed, and merged in any order. Since those three things actually do have some minor dependencies between them, this preparatory series is needed to make a few small changes to set things up to allow them to be submitted independently.

The first six patches are trivial. They should be easy to review, and as a bonus you get to find how I mess up even the trivial stuff. ;-) The final patch is more substantive and represents one of the big changes between merge-recursive and merge-ort -- namely, how notice/warning/conflict messages are reported to the user (I possibly should have included it in merge-ort-impl, but that series seemed so long already...).

Elijah Newren (7):
merge-ort: add a few includes
merge-ort: add a clear_internal_opts helper
merge-ort: add a path_conflict field to merge_options_internal
merge-ort: add a paths_to_free field to merge_options_internal
merge-ort: add function grouping comments
merge-ort: add die-not-implemented stub handle_content_merge()
function
merge-ort: add modify/delete handling and delayed output processing

 merge-ort.c | 210 +++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 191 insertions(+), 19 deletions(-)

base-commit: 00de8a7763e29fb8a034030afbd0fbfc4c818e07
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-803%2Fnewren%2Fort-common-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-803/newren/ort-common-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/803

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