Create the frontend CLI

[Horolsky]

The utility frontend CLI on Python should take care of the following functions:

• Enveloping test app execution to run tests defined in JSON/YAML (preferred to be done in Python as there are no libs for YAML and JSON Schema in Boost). The C++ backend app should be capable of running only JSON without schema validation
• Transforming raw diagnostics data in JSON into markup formats - Xunit XML, HTML, MD, Latex. 
• Optionally enveloping test execution and report transformation in a single command
• Providing code-generation function for common boiler-plate code (serialization, mocking, procedure registration)