Add a setting for the timeout stack style:

"Stack" is the default behaviour, it will search 20 messages up and 5
seconds back in time to stack the timeout.
"Stack sparingly" will try to do the same, but only if the user has not
typed a message inbetween the this and the last timeout.

Fixes #1157

src/singletons/Settings.hpp

@@ -2,6 +2,7 @@
 
 #include "BaseSettings.hpp"
 
+#include "common/Channel.hpp"
 #include "controllers/highlights/HighlightPhrase.hpp"
 #include "controllers/moderationactions/ModerationAction.hpp"
 #include "singletons/Toasts.hpp"
@@ -129,6 +130,9 @@ public:
 
     /// Moderation
     QStringSetting timeoutAction = {"/moderation/timeoutAction", "Disable"};
+    IntSetting timeoutStackStyle = {
+        "/moderation/timeoutStackStyle",
+        static_cast<int>(TimeoutStackStyle::Default)};
 
     /// Highlighting
     //    BoolSetting enableHighlights = {"/highlighting/enabled", true};