feat: Add Live Emote Updates for BTTV (#4147)

This feature is enabled by default and can be disabled in settings with the "Enable BTTV live emotes updates" setting.

Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/providers/bttv/BttvEmotes.hpp

@@ -13,6 +13,8 @@ struct Emote;
 using EmotePtr = std::shared_ptr<const Emote>;
 class EmoteMap;
 class Channel;
+struct BttvLiveUpdateEmoteUpdateAddMessage;
+struct BttvLiveUpdateEmoteRemoveMessage;
 
 class BttvEmotes final
 {
@@ -33,6 +35,41 @@ public:
                             std::function<void(EmoteMap &&)> callback,
                             bool manualRefresh);
 
+    /**
+     * Adds an emote to the `channelEmoteMap`.
+     * This will _copy_ the emote map and
+     * update the `Atomic`.
+     *
+     * @return The added emote.
+     */
+    static EmotePtr addEmote(
+        const QString &channelDisplayName,
+        Atomic<std::shared_ptr<const EmoteMap>> &channelEmoteMap,
+        const BttvLiveUpdateEmoteUpdateAddMessage &message);
+
+    /**
+     * Updates an emote in this `channelEmoteMap`.
+     * This will _copy_ the emote map and
+     * update the `Atomic`.
+     *
+     * @return pair<old emote, new emote> if any emote was updated.
+     */
+    static boost::optional<std::pair<EmotePtr, EmotePtr>> updateEmote(
+        const QString &channelDisplayName,
+        Atomic<std::shared_ptr<const EmoteMap>> &channelEmoteMap,
+        const BttvLiveUpdateEmoteUpdateAddMessage &message);
+
+    /**
+     * Removes an emote from this `channelEmoteMap`.
+     * This will _copy_ the emote map and
+     * update the `Atomic`.
+     *
+     * @return The removed emote if any emote was removed.
+     */
+    static boost::optional<EmotePtr> removeEmote(
+        Atomic<std::shared_ptr<const EmoteMap>> &channelEmoteMap,
+        const BttvLiveUpdateEmoteRemoveMessage &message);
+
 private:
     Atomic<std::shared_ptr<const EmoteMap>> global_;
 };