Split out daemon startup into two files

The Win32 StartServiceCtrlDispatcher service startup is very different
from the usual Linux exec() mechanism.

Split out the D-Bus daemon into a new object so we can consume it from
a different binary in the future.

This looks like a big change but it's 99% just moving code around.

src/fu-daemon.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2022 Richard Hughes <richard@hughsie.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#pragma once
+
+#include <glib-object.h>
+
+#define FU_TYPE_DAEMON (fu_daemon_get_type())
+G_DECLARE_FINAL_TYPE(FuDaemon, fu_daemon, FU, DAEMON, GObject)
+
+typedef enum {
+	FU_DAEMON_MACHINE_KIND_UNKNOWN,
+	FU_DAEMON_MACHINE_KIND_PHYSICAL,
+	FU_DAEMON_MACHINE_KIND_VIRTUAL,
+	FU_DAEMON_MACHINE_KIND_CONTAINER,
+} FuDaemonMachineKind;
+
+FuDaemon *
+fu_daemon_new(void);
+gboolean
+fu_daemon_setup(FuDaemon *self, GError **error);
+void
+fu_daemon_start(FuDaemon *self);
+void
+fu_daemon_stop(FuDaemon *self);
+void
+fu_daemon_set_machine_kind(FuDaemon *self, FuDaemonMachineKind machine_kind);

src/meson.build

@@ -204,6 +204,7 @@ executable(
   fu_hash,
   sources : [
     'fu-main.c',
+    'fu-daemon.c',
     daemon_src,
   ],
   include_directories : [