add fS function to simplify string formatting with fmt::format

src/util/helpers.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <fmt/format.h>
+
+namespace chatterino {
+
+template <typename... Args>
+auto fS(Args &&... args) -> decltype(fmt::format(std::forward<Args>(args)...))
+{
+    return fmt::format(std::forward<Args>(args)...);
+}
+
+}  // namespace chatterino