Suspend and resume instead of restart video stream

[ghost]

Issue Report

Currently the streaming media manager closes and reopens the video service and recreates a new video encoder in case the app moves from Background to Active (visible) application state on the phone. This issue improves the video stream by keeping the video stream open recreating the video encoder only.

Reproduction Steps

1. Start the MobileNav app on the iPhone
2. Connect the phone to an SDL head unit and select the app after it registers
3. Wait for the app to start streaming video to the head unit
4. Press Home button on the phone
5. Reopen the app on the phone

Expected Behavior

At 4. The SDL media manager should only suspend the video stream
At 5. The app should resume the video stream immediately

Observed Behavior

Because the SDL media manager restarts the video stream which takes a few seconds

OS & Version Information

• SDL iOS Version: 5.2