Improved runtime trace debugging towards something more intuitively readable.

TODO

src/lib-sieve/cmd-discard.c

src/lib-sieve/cmd-redirect.c

src/lib-sieve/cmd-stop.c

src/lib-sieve/ext-envelope.c

src/lib-sieve/ext-fileinto.c

src/lib-sieve/ext-reject.c

src/lib-sieve/plugins/enotify/cmd-notify.c

src/lib-sieve/plugins/imap4flags/cmd-flag.c

src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.c

src/lib-sieve/plugins/mailbox/tst-mailboxexists.c

src/lib-sieve/plugins/regex/mcht-regex.c

src/lib-sieve/plugins/relational/mcht-count.c

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

src/lib-sieve/plugins/variables/cmd-set.c

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

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

src/lib-sieve/sieve-address.c

src/lib-sieve/sieve-address.h

src/lib-sieve/sieve-code.c