Add config option to activate XEP-0146 commands

Some of the Commands have security implications, thats why we disable them per default
Fixes #8378

src/common/commands.py

@@ -345,9 +345,10 @@ class ConnectionCommands:
     def __init__(self):
         # a list of all commands exposed: node -> command class
         self.__commands = {}
-        for cmdobj in (ChangeStatusCommand, ForwardMessagesCommand,
-        LeaveGroupchatsCommand, FwdMsgThenDisconnectCommand):
-            self.__commands[cmdobj.commandnode] = cmdobj
+        if gajim.config.get('remote_commands'):
+            for cmdobj in (ChangeStatusCommand, ForwardMessagesCommand,
+            LeaveGroupchatsCommand, FwdMsgThenDisconnectCommand):
+                self.__commands[cmdobj.commandnode] = cmdobj
 
         # a list of sessions; keys are tuples (jid, sessionid, node)
         self.__sessions = {}

src/common/config.py

@@ -315,6 +315,7 @@ class Config:
             'show_avatar_in_tabs': [ opt_bool, False, _('Show a mini avatar in chat window tabs and in window icon')],
             'use_keyring': [opt_bool, True, _('If True, Gajim will use the Systems Keyring to store account passwords.')],
             'pgp_encoding': [ opt_str, '', _('Sets the encoding used by python-gnupg'), True],
+            'remote_commands': [opt_bool, False, _('If True, Gajim will execute XEP-0146 Commands.')],
     }, {})
 
     __options_per_key = {