Added FileNodeIterator for OpenCV 4.X to optimize vocabulary loading #69
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Since OpenCV 4.0.0, the core module has been completely reimplemented in C++.
see https://github.com/opencv/opencv/wiki/ChangeLog#version400
Iterating throught
FileNodewithout iterator has become much more slower.To compare, see
test_filenodeprogram in branch yhabib29/DBoW2#dbg-opencv4.Average time for each loop iteration in function
loadinTemplatedVocabulary.h:1454:Tested on vocabulary
ORBvoc.yml(download link) with OpenCV 3.4.2 and 4.3.0 .