Fixed Matx::solve function for non-square matrixes (#11904)

Temporary object lifetime must be greater than pointer usage.

use vload3 for half3 or float3 input vector reading,
also check read position to see if it exceed input width
Signed-off-by: NLi Peng <peng.li@intel.com>

Add a note in the documentation about Mat::ones and mat::eye. With multi-channels type (e.g. CV_8UC3), only the first channel is treated.

"custom layers" feature will not work properly in these builds.

use cv::AutoBuffer::data() to get data pointer

- added .data() methods
- added operator[] (int i)
- extend checks support to generic and debug-only cases
- deprecate existed operator* ()

The result of PyUnicode_AsUTF8() is now of type const char * rather of 
char *.

`src_pitch` may be large than data `step`

build fails with MSVS 2012 without additional flags

OpenCV binaries are compiled on Win10 environment

set global size with real output size, also optimize

max pooling index computation if necessary.
Signed-off-by: NLi Peng <peng.li@intel.com>

* Add functionality to filter homography decompositions

* documentation + small refactor

* fix comparing int to size_t (compiler warning)

* fix whitespace issues

* clarification of function return values in documentation

* refactor of function parameters and change in loop nesting

* cleanup useless .h, fix size_t to int compare, small refactor

* fix documentation and whitespace

* change output from return value to outputarray parameter

* update function docs to reflect changes in parameters

* whitespace

* failing test

* fixed warnings related to extended initialisers and improper types

* initialize vectors from arrays

* initialize vectors from arrays part 2

* fix whitespace

* fix trailing whitespace

* Include <inttypes.h> in test_filter_homography_decomp.cpp, should fix 'uint8_t' : undeclared identifier error

* updated the test (made it shorter and providing better diagnostic) and significantly improved implementation (get rid of heavy repeated and/or unnecessary operations)

* fixed compile warning; removed trailing whitespace