add new poll type | allow typed responses | update UI

...n/scala/org/bigbluebutton/core/apps/polls/PollApp2x.scala

...button/core/apps/polls/RespondToTypedPollReqMsgHdlr.scala

...luebutton/core/apps/polls/StartCustomPollReqMsgHdlr.scala

...g/bigbluebutton/core/apps/polls/StartPollReqMsgHdlr.scala

.../src/main/scala/org/bigbluebutton/core/models/Polls.scala

...ton/core/pubsub/senders/ReceivedJsonMsgHandlerActor.scala

...n/scala/org/bigbluebutton/core/running/MeetingActor.scala

...main/scala/org/bigbluebutton/common2/msgs/PollsMsgs.scala

...luebutton-html5/imports/api/polls/server/eventHandlers.js

...on-html5/imports/api/polls/server/handlers/pollStarted.js

...l5/imports/api/polls/server/handlers/userTypedResponse.js

bigbluebutton-html5/imports/api/polls/server/methods.js

...tml5/imports/api/polls/server/methods/publishTypedVote.js

...utton-html5/imports/api/polls/server/methods/startPoll.js

...utton-html5/imports/api/polls/server/modifiers/addPoll.js

bigbluebutton-html5/imports/ui/components/poll/component.jsx

bigbluebutton-html5/imports/ui/components/poll/container.jsx

...tml5/imports/ui/components/poll/live-result/component.jsx

bigbluebutton-html5/imports/ui/components/poll/styles.scss

...ebutton-html5/imports/ui/components/polling/component.jsx