Some improvements to cv::VideoCapture on windows using Directshow

Support for MJPG
Support for setting camera format using FOURCC
Support for setting frame rate
Support for get/set all video and camera filter parameters using CV_CAP_PROP_
Added popup camera settings windows
Some fixes to videoinput

Todo - would be nice to have a CameraCaptureStream [[CameraCaptureStream]] settings popup

Based on 2.3 svn trunk