Add slash command for changing room name

src/SlashCommands.js

@@ -135,6 +135,18 @@ export const CommandMap = {
         },
     }),
 
+    roomname: new Command({
+        name: 'roomname',
+        args: '<name>',
+        description: _td('Sets the room name'),
+        runFn: function(roomId, args) {
+            if (args) {
+                return success(MatrixClientPeg.get().setRoomName(roomId, args));
+            }
+            return reject(this.getUsage());
+        },
+    }),
+
     invite: new Command({
         name: 'invite',
         args: '<user-id>',

src/i18n/strings/en_EN.json

@@ -133,6 +133,7 @@
     "Changes your display nickname": "Changes your display nickname",
     "Changes colour scheme of current room": "Changes colour scheme of current room",
     "Sets the room topic": "Sets the room topic",
+    "Sets the room name": "Sets the room name",
     "Invites user with given id to current room": "Invites user with given id to current room",
     "Joins room with given alias": "Joins room with given alias",
     "Leave room": "Leave room",

src/i18n/strings/en_US.json

@@ -677,6 +677,7 @@
     "Integrations Error": "Integrations Error",
     "NOTE: Apps are not end-to-end encrypted": "NOTE: Apps are not end-to-end encrypted",
     "Sets the room topic": "Sets the room topic",
+    "Sets the room name": "Sets the room name",
     "The maximum permitted number of widgets have already been added to this room.": "The maximum permitted number of widgets have already been added to this room.",
     "To get started, please pick a username!": "To get started, please pick a username!",
     "Unable to create widget.": "Unable to create widget.",