Make voicemail view in User Status reflect new/old message status
Voicemail view in Telecom Plugin needs to properly reflect new/old message status.
This is accomplished by:
- Changing the voicemail datagrid to use a designobj
- Making a EVENT_Playback_Started interceptor to move the message from new to old, when playing.
- Making a screen handler datagrid rendering callback to change the graphic shown for new and old messages, as well as the currently selected message.
This ticket encompasses these changes.