Added STS profile data structures plus serialize/deserialize helpers for storing profile state in a compact string form.

Registered the new STS source file in the Meson and Visual Studio build definitions.

src/common/sts.h

@@ -0,0 +1,43 @@
+/* ZoiteChat
+ * Copyright (C) 2024
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifndef HEXCHAT_STS_H
+#define HEXCHAT_STS_H
+
+#include <glib.h>
+#include <time.h>
+
+G_BEGIN_DECLS
+
+typedef struct sts_profile
+{
+	char *host;
+	guint16 port;
+	time_t expires_at;
+	gboolean preload;
+} sts_profile;
+
+sts_profile *sts_profile_new (const char *host, guint16 port, time_t expires_at, gboolean preload);
+void sts_profile_free (sts_profile *profile);
+
+char *sts_profile_serialize (const sts_profile *profile);
+sts_profile *sts_profile_deserialize (const char *serialized);
+
+G_END_DECLS
+
+#endif