Refactor ConcurrentMap

* Add operator[] to ConcurrentMap which returns a TValue reference
* BTTV/FFZ channel emotes are now stored in the Emote Manager, and each Channel object has a reference to their own BTTV/FFZ channel emote map.
* Restructure EmoteManager a bit (simplify the ConcurrentMap havoc).
* Add EmoteData struct which can store emote data (for now only messages::LazyLoadedImage*)
* Add CompletionManager that does nothing

src/application.hpp

@@ -7,6 +7,7 @@
 #include "messagefactory.hpp"
 #include "resources.hpp"
 #include "windowmanager.hpp"
+#include "completionmanager.hpp"
 
 #include <QApplication>
 
@@ -20,6 +21,7 @@ public:
 
     int run(QApplication &qtApp);
 
+    CompletionManager completionManager;
     WindowManager windowManager;
     ColorScheme colorScheme;
     EmoteManager emoteManager;