CV_16F support

[huiyadanli]

https://docs.opencv.org/4.8.0/d1/d1b/group__core__hal__interface.html#ga2b02a49f1f211e23c1fc11705a1f0ce7

opencvsharp/src/OpenCvSharp/Modules/core/Struct/MatType.cs

Lines 130 to 138 in d483e90

	public const int
	CV_8U = 0,
	CV_8S = 1,
	CV_16U = 2,
	CV_16S = 3,
	CV_32S = 4,
	CV_32F = 5,
	CV_64F = 6,
	CV_USRTYPE1 = 7;

CV_USRTYPE1 is deprecated.

Related issues:
#807
#793

Can I use MakeType(7, 4) as a replacement for CV_16FC4?