merge-ort: add a preliminary simple process_entries() implementation

Add a process_entries() implementation that just loops over the paths
and processes each one individually with an auxiliary process_entry()
call.  Add a basic process_entry() as well, which handles several cases
but leaves a few of the more involved ones with die-not-implemented
messages.  Also, although process_entries() is supposed to create a
tree, it does not yet have code to do so -- except in the special case
of merging completely empty trees.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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