* Implement CI target in Makefile to emulate github CI actions & artifacts
* Improve filter for metadata
* metadata.py: update usage output for wrong number of input arguments / code review
* metadata.py: remove excessive checks for the second input argument / code review
* metadata.py: remove hard-coded model for multi-lang builds in ModelName argument processing / code review
* metadata.py: remove hard-coded models for multi-lang builds in file name pattern processing / code review
* metadata.py: update usage output to remove ambiguity about json extension for output file
* metadata.py: unify new lines style formatting
* metadata.py: sort the list of processing files in alphanumeric order before looping through them to get the same lang order on every generation in every json output file
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