Working towards complete binary support for the include extension.

src/lib-sieve/plugins/include/cmd-include.c

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

src/lib-sieve/plugins/include/ext-include-common.h

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

src/lib-sieve/sieve-binary.c

src/lib-sieve/sieve-binary.h

src/lib-sieve/sieve.c

src/sieve-bin/sieved.c