Drop Python 2 + Misc.

• Droped support for Python 2
• Added schema for generating model form
• Move configuration out of model driver classes to speed up and simplify import
• Various bug fixes for installation (search directory for Matlab, default python include/libraries, etc.)
• Allow for matlab <r2019a call signature which doesn’t include -batch option
• Various fixes for pandas compatibility across languages including reading as string vs. bytes.
• Added option for including other yamls files
• Fixed bug in CLI for getting C/C++ compiler/linker flags
• Move doutside_loop to comm (not valid on file)
• Added tests for transforms and fixed various bugs in transformations
• Added buffer comm which stores messages in-memory