New upstream version 8.4.0

AUTHORS.rst

NEWS.rst

build-aux/Makefile.in

build-aux/meson.build

build-aux/syntax-check.mk

docs/apps.rst

docs/drivers.rst

docs/drvhyperv.rst

docs/drvlxc.rst

docs/drvqemu.rst

docs/formatdomain.rst

docs/formatsnapshot.rst

docs/kbase/index.rst

docs/kbase/internals/meson.build

docs/kbase/internals/qemu-event-handlers.rst

docs/kbase/internals/qemu-migration.rst

docs/kbase/internals/qemu-threads.rst

docs/manpages/virt-xml-validate.rst

docs/remote.rst

docs/uri.rst