- add param to prevent locales from being cached

 - hide push to talk for viewer if locked by moderator

 to access and modify users and conference attributes

 - fix problem where listners window will display wrong name as data gets cached in listenerItem. When a user leaves and joins
   the old value of that listener item gets displayed

 check if shared object is null as user may have left and will result an NPE when sending private chat

 on demo after a few days but difficult to reproduce locally.

start showing some hints to the user about the camera, such as errors when the camera could not be opened, if there is no camera connected, among other things; if it is OK, it will be needed to extract the strings to the localization file

start using a timer to listen for any activity from the camera before enabling the start publishing button

avoiding an unnecessary stop broadcast event when the user open the publish window and then close it before start publishing