+ - check sender of response messages
+ - dbus spec updates:
+ - kdbus mapping
+ - NameLost/NameAcquired obsolete
+ - GVariant
+ - "const" properties (posted)
+ - port exit-on-idle logic to byebye ioctl
+ - make use of "drop" ioctl in pid 1 bus activation
+ - bus proxy: override unique id sender for messages from driver to match the well-known name
+ - bus driver: GetNameOwner() for "org.freedesktop.DBus" should return "org.freedesktop.DBus"