Refactor SplitHeader class (#4276)

* Flatten static functions in anonymous namespace

* SplitHeader ctor: Rename param

* Header: Remove unnecessary `virtual`s

* auto ptr where possible

* Add curly braces

* Comment twitch room modes

* Treat roomModes->slowMode as an integer

* Remove unused `this` from lambdas

* Add `unsigned int` overload for localizeNumbers

* Move thumbnail max age to a constexpr static & set explicit types

* Explicitly use `QObject::connect`

* Use `empty()` instead of `size()`

* Name unused parameters

* Move moderation action refreshing logic from SplitHeader to Split

src/providers/twitch/TwitchChannel.hpp

@@ -75,7 +75,21 @@ public:
         bool submode = false;
         bool r9k = false;
         bool emoteOnly = false;
+
+        /**
+         * @brief Number of minutes required for users to be followed before typing in chat
+         *
+         * Special cases:
+         * -1 = follower mode off
+         *  0 = follower mode on, no time requirement
+         **/
         int followerOnly = -1;
+
+        /**
+         * @brief Number of seconds required to wait before typing emotes
+         *
+         * 0 = slow mode off
+         **/
         int slowMode = 0;
     };