Objc binding

* Initial work on Objective-C wrapper

* Objective-C generator script; update manually generated wrappers

* Add Mat tests

* Core Tests

* Imgproc wrapper generation and tests

* Fixes for Imgcodecs wrapper

* Miscellaneous fixes. Swift build support

* Objective-C wrapper build/install

* Add Swift wrappers for videoio/objdetect/feature2d

* Framework build;iOS support

* Fix toArray functions;Use enum types whenever possible

* Use enum types where possible;prepare test build

* Update test

* Add test runner scripts for iOS and macOS

* Add test scripts and samples

* Build fixes

* Fix build (cmake 3.17.x compatibility)

* Fix warnings

* Fix enum name conflicting handling

* Add support for document generation with Jazzy

* Swift/Native fast accessor functions

* Add Objective-C wrapper for calib3d, dnn, ml, photo and video modules

* Remove IntOut/FloatOut/DoubleOut classes

* Fix iOS default test platform value

* Fix samples

* Revert default framework name to opencv2

* Add converter util functions

* Fix failing test

* Fix whitespace

* Add handling for deprecated methods;fix warnings;define __OPENCV_BUILD

* Suppress cmake warnings

* Reduce severity of "jazzy not found" log message

* Fix incorrect #include of compatibility header in ios.h

* Use explicit returns in subscript/get implementation

* Reduce minimum required cmake version to 3.15 for Objective-C/Swift binding

* Add debug build option to MacOs and iOS build scripts

* osx: allow selection of MACOSX_DEPLOYMENT_TARGET

* Add --debug_info flag to iOS and macOS builds for building with debug info

Add ability to build iOS and macOS frameworks with nonfree modules (#13424)

* Allow building ios framework with nonfree

* Allow building osx framework with nonfree

Without it set, the build will choose the current OS version as the deployment target. 10.9 is the earliest usable, since that is when OS X introduced libc++.

This version uses CMake to generate Info.plist, which should be more
reliable than the old approach.

another fix to make OpenCV more friendly for iOS developers. We now use libc++ instead of libstdc++ and clang instead of gcc to build opencv2.framework.

for supporting with iOS 6 devices

always remove libopencv_world.a before building framework to always include the up-to-date code into the framework binary.

added script to build the universal opencv2.framework for iOS device and simulator. fixed opencv_world cmake script to create static libopencv_world.a for iOS. temporarily disable compressed file storages in the case of iOS (to avoid dependency of zlib)