improves to viewMatrix_GL and related code

[kalwalt]

This pull request includes several changes to the WebARKit module, focusing on improving the handling of matrix computations and logging. The most important changes include modifying matrix initialization, adding new methods for matrix computation, and enhancing logging for debugging purposes.

Matrix computation improvements:

• WebARKit/WebARKitPattern.cpp: Changed the initialization of glViewMatrix to use CV_64FC1 for consistency with pose3d.
• WebARKit/WebARKitPattern.cpp and WebARKit/include/WebARKitPattern.h: Added a new overloaded method computeGLviewMatrix that accepts a cv::Mat parameter to compute the GL view matrix using a given pose. [1] [2]

Logging enhancements:

• WebARKit/WebARKitTrackers/WebARKitOpticalTracking/WebARKitTracker.cpp: Added logging for the camera projection matrix to aid in debugging.
• WebARKit/WebARKitTrackers/WebARKitOpticalTracking/WebARKitTracker.cpp: Modified the updateTrackable method to call the new computeGLviewMatrix method with the current pose, ensuring the GL view matrix is updated accordingly.

Minor changes:

• WebARKit/WebARKitTrackers/WebARKitOpticalTracking/WebARKitTracker.cpp: Removed an unnecessary line break in the class definition.