core: remove D-Bus policy data
core: remove unneeded dbus-{} headers
core: remove vendor-specific RPM macros
unit: remove bus-errors header
core: rid of bus-errors.h
control-request: add stub for list-sockets
control-request: add manager unit load option
systemctl: add stub for the future systemctl script
core: make control loop take Manager object as a parameter, start only from main
manager: don't broadcast to bus
manager: more bus event callback removals
manager: remove dbus-* headers
unit: simplify unit_add_to_dbus_queue()
socket: unused header
service: unused header
core: move away all minimally required D-Bus functions for bus-activated services and event handlers into dbus-activation.[ch] files
tree: remove D-Bus from the premises (holy fuck)
build-sys: cease generating D-Bus XML interfaces
tools: remove now unnecessary introspect.awk, once used for D-Bus XML interfaces
build-sys: irrelevant doc-sync target clause