Ocv3 features2d

[btsimonh]

ports features2d to OCV 3

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@48a4fc3). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #615   +/-   ##
=========================================
  Coverage          ?   56.76%           
=========================================
  Files             ?       33           
  Lines             ?     4073           
  Branches          ?       30           
=========================================
  Hits              ?     2312           
  Misses            ?     1761           
  Partials          ?        0

Impacted Files	Coverage Δ
src/Matrix.h	100% <ø> (ø)
src/init.cc	100% <100%> (ø)
src/Features2d.cc	100% <100%> (ø)
src/Matrix.cc	55.78% <100%> (ø)

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