add useIRCLayout setting

src/i18n/strings/en_EN.json

@@ -408,6 +408,7 @@
     "Enable cross-signing to verify per-user instead of per-session": "Enable cross-signing to verify per-user instead of per-session",
     "Show info about bridges in room settings": "Show info about bridges in room settings",
     "Enable Emoji suggestions while typing": "Enable Emoji suggestions while typing",
+    "Use IRC layout": "Use IRC layout",
     "Use compact timeline layout": "Use compact timeline layout",
     "Show a placeholder for removed messages": "Show a placeholder for removed messages",
     "Show join/leave messages (invites/kicks/bans unaffected)": "Show join/leave messages (invites/kicks/bans unaffected)",

src/settings/Settings.js

@@ -94,6 +94,12 @@ export const SETTINGS = {
     //     // not use this for new settings.
     //     invertedSettingName: "my-negative-setting",
     // },
+    "feature_alternate_message_layouts": {
+        isFeature: true,
+        displayName: _td("Alternate message layouts"),
+        supportedLevels: LEVELS_FEATURE,
+        default: false,
+    },
     "feature_pinning": {
         isFeature: true,
         displayName: _td("Message Pinning"),
@@ -164,6 +170,11 @@ export const SETTINGS = {
         default: true,
         invertedSettingName: 'MessageComposerInput.dontSuggestEmoji',
     },
+    "useIRCLayout": {
+        supportedLevels: LEVELS_ACCOUNT_SETTINGS,
+        displayName: _td('Use IRC layout'),
+        default: false,
+    },
     "useCompactLayout": {
         supportedLevels: LEVELS_ACCOUNT_SETTINGS,
         displayName: _td('Use compact timeline layout'),