Added support for Twitch's Chat Replies (#3722)

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

src/controllers/filters/parser/FilterParser.cpp

@@ -82,6 +82,7 @@ ContextMap buildContextMap(const MessagePtr &m, chatterino::Channel *channel)
          m->flags.has(MessageFlag::RedeemedChannelPointReward)},
         {"flags.first_message", m->flags.has(MessageFlag::FirstMessage)},
         {"flags.whisper", m->flags.has(MessageFlag::Whisper)},
+        {"flags.reply", m->flags.has(MessageFlag::ReplyMessage)},
 
         {"message.content", m->messageText},
         {"message.length", m->messageText.length()},

src/controllers/filters/parser/Tokenizer.hpp

@@ -25,6 +25,7 @@ static const QMap<QString, QString> validIdentifiersMap = {
     {"flags.reward_message", "channel point reward message?"},
     {"flags.first_message", "first message?"},
     {"flags.whisper", "whisper message?"},
+    {"flags.reply", "reply message?"},
     {"message.content", "message text"},
     {"message.length", "message length"}};