enables an ordered chain of full-screen post processing effects

Bug fixes: using mask with BinaryDescriptor  (#1652)

* Bug fixes: erasing an element from std::vector should not move iterator forward

* Bug fixes: add a NULL checking

* Remove the appoggio matrix generation, which is useless

Added if condition, whether faces are detected or not, will help to keep program running for some images.
If imwrite used along with imshow, it may produce error for :  No faces found.Aborting.. in function 'fit' (Bad Argument).

Add AprilTag dictionaries to be able to detect AprilTag markers. Add ArUco and AprilTag 2 citations.

* android: fix build warnings

* build: fix warnings

with Ogre 1.11 OGRE_INCLUDE_DIRS has only one element and the '}'
corrupting the last include path becomes noticable.

- 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