Fixed constant value for focus mode FOCUS_MODE_CONTINUES_PHOTO;
Add setters and getters for exposure lock and white balance lock flags;
Excluded camera restart for all setters except frame size.

1. Remove whole-document highlighting in some function links
2. fix the function alias `readwriteimagevideo`

2. change an external link to maintain consistency with the previous tutorial

Fixed an issue with weight assignment causing the resulting GMM weights to be unsorted in the CUDA and OCL versions of BackgroundSubtractorMOG2