Add support to register with a room

`/affiliation register` can now be used to register a nickname with a
MUC.

Tested with a server without forms. Couldn't find a server which
supports forms yet.

Implements https://github.com/profanity-im/profanity/issues/1210

src/command/cmd_ac.c

@@ -756,6 +756,7 @@ cmd_ac_init(void)
     affiliation_cmd_ac = autocomplete_new();
     autocomplete_add(affiliation_cmd_ac, "list");
     autocomplete_add(affiliation_cmd_ac, "request");
+    autocomplete_add(affiliation_cmd_ac, "register");
     autocomplete_add(affiliation_cmd_ac, "set");
 
     role_cmd_ac = autocomplete_new();

src/command/cmd_defs.c

@@ -695,14 +695,16 @@ static struct cmd_t command_defs[] = {
       CMD_SYN(
               "/affiliation set <affiliation> <jid> [<reason>]",
               "/affiliation list [<affiliation>]",
-              "/affiliation request")
+              "/affiliation request",
+              "/affiliation register")
       CMD_DESC(
               "Manage room affiliations. "
               "Affiliation may be one of owner, admin, member, outcast or none.")
       CMD_ARGS(
               { "set <affiliation> <jid> [<reason>]", "Set the affiliation of user with jid, with an optional reason." },
               { "list [<affiliation>]", "List all users with the specified affiliation, or all if none specified." },
-              { "request", "Request voice."})
+              { "request", "Request voice."},
+              { "register", "Register your nickname with the MUC."})
       CMD_NOEXAMPLES
     },
 

src/command/cmd_funcs.c

@@ -4166,6 +4166,11 @@ cmd_affiliation(ProfWin* window, const char* const command, gchar** args)
         return TRUE;
     }
 
+    if (g_strcmp0(cmd, "register") == 0) {
+        iq_muc_register_nick(mucwin->roomjid);
+        return TRUE;
+    }
+
     cons_bad_cmd_usage(command);
     return TRUE;
 }