Show previous livechats

packages/rocketchat-livechat/client/ui.js

...chat-livechat/client/views/app/tabbar/visitorHistory.html

...etchat-livechat/client/views/app/tabbar/visitorHistory.js

...ketchat-livechat/client/views/app/tabbar/visitorInfo.html

packages/rocketchat-livechat/package.js

packages/rocketchat-livechat/server/methods/closeRoom.js

packages/rocketchat-livechat/server/models/Rooms.js

...rocketchat-livechat/server/publications/visitorHistory.js