thunderbolt: new panel for device management

Thunderbolt devices need to be approved before they can be used.
This is done via the boltd system daemon and gnome-shell. The new
panel enables the user to manage thunderbolt devices, i.e.:

 - forget devices that have previously been authorized
 - authorize currently unauthorize devices

Additionally authorization of devices an be temporarily disabled
to ensure no evil device will gain access to the computers
resources.

File starting with "bolt-" are copied from bolt's source tree
and currently correspond to the bolt upstream commit with the id
f22b1cd6104bdc2b33a95d9896b50f29a141b8d8
They can be updated from bolt via the update-from-bolt.sh script.

panels/thunderbolt/bolt-error.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2017 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *       Christian J. Kellner <christian@kellner.me>
+ */
+
+#pragma once
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+/**
+ * BoltError:
+ * @BOLT_ERROR_FAILED: Generic error code
+ * @BOLT_ERROR_UDEV: UDev error
+ *
+ * Error codes used inside Bolt.
+ */
+enum {
+  BOLT_ERROR_FAILED = 0,
+  BOLT_ERROR_UDEV,
+  BOLT_ERROR_NOKEY,
+  BOLT_ERROR_BADKEY,
+  BOLT_ERROR_CFG,
+} BoltError;
+
+
+GQuark bolt_error_quark (void);
+#define BOLT_ERROR (bolt_error_quark ())
+
+/* helper function to check for certain error types */
+gboolean bolt_err_notfound (const GError *error);
+gboolean bolt_err_exists (const GError *error);
+gboolean bolt_err_inval (const GError *error);
+gboolean bolt_err_cancelled (const GError *error);
+
+gboolean bolt_error_propagate_stripped (GError **dest,
+                                        GError **source);
+
+G_END_DECLS