feat(import-fifa17): emit the Core reclassify request from the catalog

The importer already knows every definition's kind, so it writes the mapping
Core needs to correct a club imported before the taxonomy existed. Applied to
the real 1989-item club: 20 rows corrected (17 consumables + 3 staff), 1966
players already right, 0 unmatched definitions.

openfut-import-fifa17/src/main.rs

@@ -123,6 +123,11 @@ fn run() -> Result<ExitCode> {
             sum.supported_instances,
             sum.deferred_instances
         );
+        println!(
+            "  reclassify   : {} (run `openfut-core reclassify <file>` to correct \
+             content_kind on a club imported before the taxonomy existed)",
+            sum.reclassify.display()
+        );
         println!(
             "  non-player   : {} definition(s), {} instance(s) (consumable/staff)",
             sum.non_player_definitions, sum.non_player_instances