Streaming avatar audio status and Applause button

- Renaming avatar from context menu now works as it should (originally, other people don't see the change)
- Late audiences can see Applause and Volunteer buttons if they're enabled
- Applause button should work now, issue https://github.com/AUTUpStageTeam/UpStage2013/issues/148
- Used unicode symbol to show streaming avatar's global mute status (visible both on stage and mirror box), issue https://github.com/AUTUpStageTeam/UpStage2013/issues/153

![screen shot 2556-10-14 at 20 30 46](https://f.cloud.github.com/assets/717270/1323997/26521d1c-34a3-11e3-8fdd-a93d26905b7a.png)

![screen shot 2556-10-14 at 20 19 07](https://f.cloud.github.com/assets/717270/1323998/267ab68c-34a3-11e3-8184-72601dc7fb34.png)