Keep track of recording time if camera doesn't provide it.
Make sure camera info is received (if camera ACKs the request)
Keep track of camera's heartbeat. Remove camera if not heard from after a while.
Update MAVLink

Making sure the commands are sent to the camera's actual component ID rather than a hardcoded constant.

Fix merge issues

This reverts commit 52160d80.

Fixed inverse logic in camera parameter retry count
Skip close timeout if not Windows

Pulling mavlink with a reversal for the CAMERA_IMAGE_CAPTURED message. It's now back as it was so it won't break existing code.
The pull also brought changes to the GPS_RAW_INT message. Only MockLink uses. I entered zeros for all new fields.