[wallet] Refactor ProcessImport() to call ProcessImportLegacy()
[wallet] Refactor ProcessImport() to call ProcessImportLegacy()

This is almost entirely a move-only commit.

Reviewer hint: use --color-moved=zebra for review.

peercoin/peercoin,peercoin/peercoin,peercoin/peercoin,DigitalPandacoin/pandacoin,peercoin/peercoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,peercoin/peercoin,peercoin/peercoin,DigitalPandacoin/pandacoin