wrapping remaining xfeature2d classes to scripting

Remove AGAST (for push to opencv's main)

fixed compile error and warning

SYNC upstream

fixed contrib code to match the HAL

missing type Ptr_DualTVL1OpticalFlow

added missing typePtr_DualTVL1OpticalFlow

Support for HAL module

Fix (typo) bug in AGAST scoring routines.

Add AGAST detector

Locally uniform comparison image descriptor

line_descriptor module fix vs2013 build

add a 'split' train method to datasets/lfw_benchmark

[fix issue #3996] delete private.hpp include in sample code

fix issue for vs versions which aren't standarized for the c99 standard

corrected the testing data path for latentsvm detector and some typos

Link Correction

Adapt reg sample to changes in features detectors

Bug fixing

Adapt to changes in the interface of feature detectors, using now
Feature2D interface.

Wrap face module with python and java

The bug has the same origin as:
https://github.com/Itseez/opencv_contrib/pull/187
The problem was in "fast" version of function generating a binary code
for ensemble classifier posterior probability calculation. Bug was
eliminated by fixing the order of "values" in offsets calculating
function

Unused header

standard