Adding depth and registration evaluation tools to examples directory

[resuther-msft]

Fixes

Description of the changes:

• Adding C++ code that leverages OpenCV to evaluate the depth calibration of k4a devices (depth_eval_tools/depth_eval).
• Adding C++ code that leverages OpenCV to evaluate the registration between the sensors of a k4a device (depth_eval_tools/transformation_eval).
• Adding C++ code that leverages OpenCV to collect and process images from a k4a device for the aforementioned tools and new Calibration and Registration tools added in another pull request (depth_eval_tools/collect).
• Ading C++ code that leverages OpenCV to process mkv captures for the aforementioned tools and dump images from a capture (depth_eval_tools/mkv2images).
• Adding C++ helper code that leverages OpenCV and is used by the aforementioned tools (depth_eval_tools/kahelpers).
• Adding an overview README.md to describe how to use the tools, and individual README.md files with more details for each tool.
• Adding CMakeLists.txt files for examples/depth_eval_tool directory and for each aforementioned tool.
• Modifying CMakeLists.txt file in examples directory to include depth_eval_tools directory.
• Repo fails to build using "x86_64 Native Tools Command Prompt for VS 2017" (both with new additions as well as without) but builds successfully using "x64 Native Tools Command Prompt for VS 2019". Build issues seem to be related to opencv module architecture differing from target architecture.

Before submitting a Pull Request:

• I reviewed CONTRIBUTING.md
• I built my changes locally
• I ran the unit tests
• I ran the functional tests with a device
• I ran the performance tests with a device

I tested changes on:

• Windows
• Linux

[JonathanESantos]

Minor suggestions, no major errors found.

[jaygullapalli]

/azp run

[azure-pipelines]

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