refactor: make a single MessageBuilder (#5548)

src/util/Helpers.hpp

@@ -6,6 +6,7 @@
 
 #include <cmath>
 #include <optional>
+#include <utility>
 #include <vector>
 
 namespace chatterino {

src/util/IrcHelpers.hpp

@@ -97,4 +97,17 @@ inline QDateTime calculateMessageTime(const Communi::IrcMessage *message)
     return QDateTime::currentDateTime();
 }
 
+// "foo/bar/baz,tri/hard" can be a valid badge-info tag
+// In that case, valid map content should be 'split by slash' only once:
+// {"foo": "bar/baz", "tri": "hard"}
+inline std::pair<QString, QString> slashKeyValue(const QString &kvStr)
+{
+    return {
+        // part before first slash (index 0 of section)
+        kvStr.section('/', 0, 0),
+        // part after first slash (index 1 of section)
+        kvStr.section('/', 1, -1),
+    };
+}
+
 }  // namespace chatterino