It doesn't match Dovecot convention.

This prevents wrapping the integer value and fixes an ubsan complaint.

The previous commit should already prevent this, but this makes sure it
can't become broken in the future either. It makes the performance a tiny
bit worse, but that's not practically noticeable.

ManageSieve doesn't allow NULs in strings.

This fixes a bug with unescaping a string with NULs: str_unescape() could
have been called for memory that points outside the allocated string,
causing heap corruption. This could cause crashes or theoretically even
result in remote code execution exploit.

Found by Nick Roessler and Rafi Rubin

The str_append_n() function is now deprecated. At no occasion, the occurence of
NUL in the data is possible or relevant, so each instance is replaced with
str_append_data() rather than str_append_max().

Dovecot core doesn't have copyright notices in header files.

Cleanup performed with the following semantic patch:

	@@
	expression E;
	@@

	- if (E != NULL) {
	- 	i_stream_unref(&E);
	- }
	+ i_stream_unref(&E);

	@@
	expression E;
	@@

	- if (E != NULL) {
	- 	o_stream_unref(&E);
	- }
	+ o_stream_unref(&E);

Otherwise the error status is overwritten.
Problem found by Coverity.

Ported Dovecot's istream-jsonstr for ManageSieve syntax.

Found with clang -Wstrict-bool.

perl -i -pe 's/unsigned int ([^,:;]+):1;/bool $1:1;/' **/*.[ch]

lib-managesieve: changed EPROTO error to EIO in ManageSieve string stream because it is apparently not known in BSD.

ManageSieve: added support for reading quoted and literal strings as a stream. Fixes support for handing large SASL responses.
Also resolves long-standing FIXME regarding the second parameter of PUTSCRIPT: it can now be a quoted string.
Includes a few small changes in the login daemon that were done in the dovecot equivalents before.