Rework dbus handling

Remove the Daemon object and remove all dbus code from the main
objects. We can use the signals in a separate module to create and
destroy the DBus interfaces.
Move the dbus protocol in a module
Move the autolink policy to a module

pinos/server/meson.build

@@ -3,7 +3,6 @@ pinoscore_headers = [
   'client-node.h',
   'command.h',
   'core.h',
-  'daemon.h',
   'data-loop.h',
   'link.h',
   'main-loop.h',
@@ -19,7 +18,6 @@ pinoscore_sources = [
   'client-node.c',
   'command.c',
   'core.c',
-  'daemon.c',
   'data-loop.c',
   'link.c',
   'main-loop.c',