Historic messages behaviour

"Crossed and Greyed" -> default (and is current default)
"Crossed" -> just crossed
"Greyed" -> just greyed
"No change" -> no change in appearance

src/widgets/settingspages/GeneralPage.cpp

@@ -263,7 +263,9 @@ void GeneralPage::initLayout(SettingsLayout &layout)
 
     layout.addTitle2("Misc");
     layout.addCheckbox("Show twitch whispers inline", s.inlineWhispers);
-    layout.addCheckbox("Grey out historic messages", s.greyOutHistoricMessages);
+    layout.addDropdown("Historic messages appearance",
+                       {"Crossed and Greyed", "Crossed", "Greyed", "No change"},
+                       s.historicMessagesAppearance);
 
     /*
     layout.addTitle2("Cache");

src/widgets/settingspages/LookPage.cpp

@@ -182,9 +182,11 @@ void LookPage::addMessageTab(LayoutCreator<QVBoxLayout> layout)
 
     layout.append(
         this->createCheckBox("Compact emotes", getSettings()->compactEmotes));
-
-    layout.append(this->createCheckBox("Grey out historic messages",
-                                       getSettings()->greyOutHistoricMessages));
+    /// greyOutHistoricMessages setting changed by hemirt from checkbox to
+    /// historicMessagesBehaviour dropdown QString option
+    // layout.append(this->createCheckBox("Grey out historic messages",
+    //                                   getSettings()->greyOutHistoricMessages));
+    ///
     // --
     layout.emplace<Line>(false);