Simpler, more modern API for listen/notify. (#910)

No more inheritance, no more virtual functions, no more mandatory base
class — just pass in a lambda or any other matching callable.

Only one handler per channel — makes the channel name the key, and you
can disable a handler simply by overwriting it.

No more hassle with case-insensitive channel names.  We'll just quote
them consistently.

No more logging of exceptions, to a notice-processing callback which
probably just ignores the message.  Exceptions during handling now just
propagate up the call chain.

NEWS

@@ -1,5 +1,6 @@
 7.10.0
  - Deprecate `errorhandler`; replace with lambda-friendly "notice handlers."
+ - Deprecate `notification_receiver`; replace with "notification handlers"
  - Bump minimum CMake version to 3.28. (#874)
  - Fixed error message on clashing transaction focuses. (#879)
  - Don't call`/bin/true`; macOS doesn't have it.  Just call `true`. (#885)

config/Makefile.in

@@ -124,7 +124,7 @@ am__can_run_installinfo = \
   esac
 am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) $(LISP)
 am__DIST_COMMON = $(srcdir)/Makefile.in compile config.guess \
-	config.sub install-sh ltmain.sh missing mkinstalldirs
+	config.sub depcomp install-sh ltmain.sh missing mkinstalldirs
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 ACLOCAL = @ACLOCAL@
 AMTAR = @AMTAR@

configure

@@ -17160,7 +17160,6 @@ then
 			-Wattribute-alias=2 \
 			-Wlogical-op \
 			-Wmismatched-tags \
-			-Wnoexcept \
 			-Wredundant-tags \
 			-Wrestrict \
 			-Wstringop-overflow \
@@ -18690,7 +18689,7 @@ if test "$found_fslib" != "yes"
 then
 	as_fn_error $? "
 There seems to be <filesystem> support, but I could not figure out now to make
-it work.  You'll have to add set your own build options for this.
+it work.  You'll have to set your own build options for this.
 	" "$LINENO" 5
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $result_msg" >&5

configure.ac

@@ -182,7 +182,6 @@ then
 			-Wattribute-alias=2 \
 			-Wlogical-op \
 			-Wmismatched-tags \
-			-Wnoexcept \
 			-Wredundant-tags \
 			-Wrestrict \
 			-Wstringop-overflow \

doc/requirements.txt

@@ -1,4 +1,5 @@
-# XXX: Pin versions.
+# TODO: Pin versions.
+# TODO: Do we even still need this file?
 dia
 sphinx-rtd-theme
 myst-parser