refactor: load Twitch emotes from Helix (#5239)

src/providers/twitch/TwitchAccountManager.hpp

@@ -2,6 +2,7 @@
 
 #include "common/ChatterinoSetting.hpp"
 #include "common/SignalVector.hpp"
+#include "util/Expected.hpp"
 #include "util/QStringHash.hpp"
 #include "util/RapidJsonSerializeQString.hpp"
 
@@ -58,6 +59,10 @@ public:
 
     SignalVector<std::shared_ptr<TwitchAccount>> accounts;
 
+    /// The signal is invoked with (caller, error) where caller is the argument
+    /// passed to reloadEmotes() and error.
+    pajlada::Signals::Signal<void *, ExpectedStr<void>> emotesReloaded;
+
 private:
     enum class AddUserResponse {
         UserAlreadyExists,