hat-trie: merge hattrie_create with hattrie_create_n

src/contrib/hat-trie/hat-trie.h

src/knot/conf/confio.c

src/knot/dnssec/zone-sign.c

src/knot/zone/contents.c

src/knot/zone/zone-tree.c

src/libknot/db/db_trie.c

src/libknot/db/db_trie.h

src/utils/common/lookup.c

src/utils/knot1to2/cf-lex.c

src/utils/knot1to2/cf-parse.tab.c

src/utils/knot1to2/cf-parse.y

src/utils/knot1to2/main.c

src/utils/knotc/commands.c

tests/contrib/test_hat-trie.c