- minimize library initialization time (lazy calculations of program hash)
- LRU cache of in-memory compiled programs

Added OpenVX based processing to FAST (#7720)

* added wrapper for OVX FAST & fixes to IVX wrappers

* fixed type checks in wrappers, array downloading code simplified

* rewritten for new macro use

OpenVX pyrDown wrappers (#7793)

* wrappers for vx_pyramid added

* initial version of pyrDown() wrapper added

* disabled for Khronos

* rewritten for new macro use; border mode added to node

OpenVX optical flow PyrLK wrappers added (#7774)

* wrappers for vx_pyramid added

* initial version of Optical Flow PyrLK wrappers added

* array downloading code simplified

* disabled due to bad accuracy; fixed bugs, e.g. vendor-specific ones

* rewritten for new macro use

Build with ICC

cmake: update PDB support condition

Unfortunately there is no stable support for installation of PDB files in CMake.
This patch is just eliminate problems with modern versions.

(2.4) Backports from master branch (#7854)

(2.4) Build with ICC

(2.4) Fix CUDA warnings

Currently, to select a submatrix of a N-dimensional matrix, it requires
two lines of code while only one line of code is required if using a 2D
array.

I added functionality to be able to select an N-dim submatrix using a
vector list instead of a Range pointer. This allows initializer lists to
be used for a one-line selection.