lib-sieve: Drop old settings infrastructure

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

src/lib-sieve/Makefile.am

...ugins/vnd.dovecot/environment/ext-vnd-environment-items.c

src/lib-sieve/sieve-actions.c

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

src/lib-sieve/sieve-address-source.h

src/lib-sieve/sieve-common.h

src/lib-sieve/sieve-script.c

src/lib-sieve/sieve-settings.old.c

src/lib-sieve/sieve-settings.old.h

src/lib-sieve/sieve-storage-sync.c

src/lib-sieve/sieve-storage.c

src/lib-sieve/sieve-types.h

src/lib-sieve/sieve.c

src/lib-sieve/storage/file/sieve-file-storage.c

src/managesieve/managesieve-capabilities.c

src/managesieve/managesieve-client.c

src/managesieve/managesieve-settings.c

src/managesieve/managesieve-settings.h

src/plugins/doveadm-sieve/doveadm-sieve-cmd.c