Adds option to mute ping sound for specific channels (#990)

Co-Authored-By: hemirt <hemirt@hemirt.com>

src/Application.hpp

@@ -18,6 +18,7 @@ class TaggedUsersController;
 class AccountController;
 class ModerationActions;
 class NotificationController;
+class PingController;
 
 class Theme;
 class WindowManager;
@@ -62,6 +63,7 @@ public:
     CommandController *const commands{};
     HighlightController *const highlights{};
     NotificationController *const notifications{};
+    PingController *const pings{};
     IgnoreController *const ignores{};
     TaggedUsersController *const taggedUsers{};
     ModerationActions *const moderationActions{};