Allow plugin style extension for new languages

[patfinder]

Should we change the code structure in a way that it allows to add new language support easily and properly at runtime ?

[patfinder]

Hi @scottrogowski
I have made changes to a clone of this repo here regarding change for this issue.
Could you please create (or grant me the permission to) a PR to merge these changes?
The changes will support adding new language dynamically, by simply creating a new processor (like current python.py, javascript.py ...) for a new language.
Please let me know if you want to discuss more about this.

PS: the branch to merge is dynamic-langs

Thank you.
Vuong