Renamed extension object registry.

...gins/comparator-i-ascii-numeric/ext-cmp-i-ascii-numeric.c

src/lib-sieve/plugins/copy/ext-copy.c

src/lib-sieve/plugins/enotify/vmodf-encodeurl.c

src/lib-sieve/plugins/imapflags/tag-flags.c

src/lib-sieve/plugins/regex/ext-regex-common.c

src/lib-sieve/plugins/relational/ext-relational-common.c

src/lib-sieve/plugins/subaddress/ext-subaddress.c

src/lib-sieve/plugins/variables/ext-variables-modifiers.c

src/lib-sieve/sieve-address-parts.c

src/lib-sieve/sieve-binary.c

src/lib-sieve/sieve-binary.h

src/lib-sieve/sieve-common.h

src/lib-sieve/sieve-comparators.c

src/lib-sieve/sieve-extensions.h

src/lib-sieve/sieve-match-types.c

src/lib-sieve/sieve-objects.c

src/testsuite/testsuite-objects.c

src/testsuite/testsuite-objects.h