Updated all copyright messages to the new year.

src/lib-sieve-tool/mail-raw.c

src/lib-sieve-tool/mail-raw.h

src/lib-sieve-tool/sieve-tool.c

src/lib-sieve-tool/sieve-tool.h

src/lib-sieve/cmd-discard.c

src/lib-sieve/cmd-if.c

src/lib-sieve/cmd-keep.c

src/lib-sieve/cmd-redirect.c

src/lib-sieve/cmd-require.c

src/lib-sieve/cmd-stop.c

src/lib-sieve/cmp-i-ascii-casemap.c

src/lib-sieve/cmp-i-octet.c

src/lib-sieve/ext-encoded-character.c

src/lib-sieve/ext-envelope.c

src/lib-sieve/ext-fileinto.c

src/lib-sieve/ext-reject.c

src/lib-sieve/mcht-contains.c

src/lib-sieve/mcht-is.c

src/lib-sieve/mcht-matches.c

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