minor bug fixes

Resolved issues - Minor bug fixes what’s new - Setup Zhumu Rooms using a pairing code. - Security enhancements - Background noise suppression

Minor bug fixes Optimize the experience of iOS 11

1. Display the name of the meeting room at the lower right corner of the window after login from the iPad 2. If there are multiple camera connected to the meeting room system, a new option "Switch camera " will be shown in iPad 3. If the display is touch screen, it's able to share the white board directly 4. It's able to input the word and select the objects in the whiteboard in this version 5. A new feature "Optimized full screen share" is added in the screen share functionality 6. In a single screen meeting, a new option "Video thumbnail " is added to the screen share functionality. The video thumbnail is able to be hided, moved or enlarged during the screen share. 7. In the participant management, a new option "Mute when joining the meeting " is added to the "More" menu 8. In the participant management, the new features are “Turn off the video ", "Select the video “,"Set the focus video " and "Request to control the camera ". If there are 2 displays, it's able to select the video for each display separately 9. If there are more than 25 participants, it's able to turn pages in gallery mode 10. It's able to display subtitle in the meeting. When there's a subtitle, there will be a prompt to enable “Closed caption”. After that, the subtitle will be shown.