- almost all functionality of this module is covered by OpenCV dnn module
- module build has been broken for the long time due strong conflict with OpenCV dnn module
- requires external tinydnn library
- there are no tests

- eliminated "float th = 1e-5f" magic value (replaced to explicit checks)
- eliminate manual memory allocation
- avoid out of range access (i == alls)

Add CV_OVERRIDE

also remove superficial CS conversion in fixCameraYawAxis

by keeping Camera oriented in OpenCV conventions instead of doing the
conversion for each SceneNode.