Enhance TestVC4C

[nomaddo]

Current TestVC4C is a little bit hard to use daily.

• Want to specify each kernels
  • to execute failed tests again
• Want to make regression-groups easier
  Current implementation is hard to do that
• If the compiler make segv during testing, testing stopped and we cannot know the results of other cases
• Want to know how to execute each tests in the program (to replicate execution of tests as CLI command)
  • compilation option (-D, for example)
  • parameters for emulation
• Want to change test scenarios without re-compilation
• Want to make speed up by parallel execution
  • VC4C itself works using multi-thread, but for compilation of single kernel, the execution is sequential.

I think it's better to rewrite TestVC4C by other testing framework of Python or something similar.
@doe300 What do you think of this?