Add new command placeholders: {channel.name}, {channel.id}, {stream.game}, {stream.title}, {my.id}, {my.name} (#3155)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/helper/ChannelView.cpp

@@ -2101,12 +2101,24 @@ void ChannelView::handleLinkClick(QMouseEvent *event, const Link &link,
                 }
             }
 
-            value.replace("{user}", layout->getMessage()->loginName)
-                .replace("{channel}", this->channel_->getName())
-                .replace("{msg-id}", layout->getMessage()->id)
-                .replace("{message}", layout->getMessage()->messageText);
+            value = getApp()->commands->execCustomCommand(
+                QStringList(), Command{"(modaction)", value}, true, channel,
+                {
+                    {"user.name", layout->getMessage()->loginName},
+                    {"msg.id", layout->getMessage()->id},
+                    {"msg.text", layout->getMessage()->messageText},
+
+                    // old placeholders
+                    {"user", layout->getMessage()->loginName},
+                    {"msg-id", layout->getMessage()->id},
+                    {"message", layout->getMessage()->messageText},
+
+                    // new version of this is inside execCustomCommand
+                    {"channel", this->channel()->getName()},
+                });
 
             value = getApp()->commands->execCommand(value, channel, false);
+
             channel->sendMessage(value);
         }
         break;