VideoCapture Direct Show. Added getter for CV_CAP_PROP_CONVERT_RGB, CAP_PROP_CHANNEL properties. (#14592)

* Added getter for CV_CAP_PROP_CONVERT_RGB, CAP_PROP_CHANNEL properties.
Some refactoring.

* One space less.

Fix dnn visualizer (#14537)

* Fixed print layer params

* Fix print

* java: fix java missing_consts

* java: test Calib3d constants

Usage example:
- run.py -a -t java --package=calib3d

HSV and HLS color conversions rewritten to wide intrinsics (#14616)

* RGB2HSV_b vectorized

* RGB2HSV_f: widen

* RGB2HSV_f: shorten, more intuitive

* HSV2RGB_f and HSV2RGB_b widen

* hls2rgb_f widen

* instrumentation instead vx_cleanup

* RGB2HLS_f widen

* RGB2HLS_b rewritten to wide universal intrinsics

* define guard against no SIMD code

* hls2rgb_b rewritten

* extra define removed

* warning fixed

* hls2rgb_b: performance fixed

Fix issue with solvePnPRansac and Nx3 1-channel input when the number of points is 5. Try to uniform the input shape of projectPoints and undistortPoints.

previously floodFill() is white-list without any implementation.
floodFill() is now fully functional in JS.

Lab, Luv and XYZ conversions rewritten to wide intrinsics (#14106)

* rgb2xyz<float> re-vectorized

* rgb2xyz_i vectorized for ushort and uchar

* xyz2rgb<float> vectorized

* xyz2rgb_i vectorized for both uchar and ushort

* intermediate conversions (int->float) rewritten

* packed rgb2luv rewritten

* (some) float conversions rewritten

* burnt volatile int _3 and similar

* RGB2Lab_b rewritten

* tests: logging made better

* RGB2Lab_f (LRGB path) rewritten

* Lab2RGBfloat rewritten

* Lab2RGBinteger and Lab2RGB_b rewritten to wide universal intrinsics

* Luv2RGBinteger wide vectorized

* RGB2Lab_b fixed: v_sub_wrap instead of saturated sub

* warnings fixed

* trying to fix compilation on older compilers

* using 16x8 registers for 8-element dot product

* cleanup added

* splineInterpolate: loop unrolled, perf fix for f32x4

* Lab2RGBfloat: grab 2x more data to process on f32x4

* nrepeats for Luv2RGBfloat, +20% perf

* minor

* nrepeats to RGB2Lab_f

* Lab2RGBinteger: no tab for linear BGR

* nrepeats for RGB2Luvfloat

* Luv2RGBinteger: no tab for linear RGB

* +10% more to perf of Luv2RGBfloat

* nrepeats for 256-simd for Lab2RGBfloat

* less warnings

* BOM removed

* CV_SIMD_WIDTH used for lanes number checking

* trilinearPackedInterpolate: 128-bit specialization added

* fix build; no vx_cleanup(), instrumentation instead

* added support for Eigen cross-compilation

* cmake: fix Eigen detection

Fix wrong indentation as well while at it

Add SOLVEPNP_IPPE for planar pose estimation. Add solvePnPGeneric function that returns all the pose solutions and the reprojection errors.