Auto-set default preview size and format for different cameras #410
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Current samples need to set preview size and format in samples or wrappers. That is, an UVC app using this library won't work on all cameras with different size or format.
In #175, Roger has applied usbCameraTest0 to adapt different size with least area error.
Different from his contribution, my work tries to find proper size and format with least absolute error of width and height, which is directly implemented in library instead of app.
The two commits work fine on my two cameras, one is 640x480@MJPEG and the other is 50x50@YUYV.
The PR needs to be reviewed, thanks.