Update room object

[malakada]

The room object returned by Candy.Core.getRoom(roomJid) is incomplete. It's missing:

• a way to get to the DOM pane element
• the information from Candy.View.Pane.Chat.rooms[roomJid]:
  • enableScroll: false
  • id: "068b38b88f05b8304d9c6dfb06ac2e21"
  • mentionsCount: 0
  • messageCount: 4
  • name: "thing"
  • scrollPosition: -1
  • targetJid: "thing@conference.powerhrg.com"
  • type: "groupchat"
  • user: Candy.Core.ChatUser
  • usercount: 1

Related triggerHandler PRs:

• [WIP] candy:core:chat:invite triggerHandler #4
• [WIP] candy:core.presence.room triggerHandler #5
• [WIP] candy:core.presence.leave triggerHandler #6
• [WIP] candy:core.presence.error triggerHandler #7
• [WIP] candy:core:message:chatstate triggerHandler #8
• [WIP] candy:view.presence triggerHandler #9
• [WIP] candy:view.roster.after-context-menu triggerHandler #10
• [WIP] candy:view.roster.context-menu triggerHandler #11
• [WIP] candy:view.message.before-send triggerHandler #12
• [WIP] candy:view.private-room.after-open triggerHandler #13
• [WIP] candy:view.room.after-add triggerHandler #15
• [WIP] candy:view.room.after-hide & candy:view.room.after-show triggerHandlers #17
• [WIP] candy:view.room.after-subject-change triggerHandler #18
• [WIP] candy:view.roster.before-update & candy:view.roster.after-update triggerHandlers #19

Of the above list, PRs 12, 13, 15, 17, 18, and 19 are probably the most relevant as they need information from the Chatroom object that it doesn't currently provide.

This is where the room object is first created: https://github.com/mojolingo/candy/blob/dev/src/view/pane/room.js#L76