--init should take template arguments

Basic design:

 - goal is to get up to speed /faster/ than writing a batch file, but be modifiable like a batch file
 - tmpl arguments point back to raw github files in this repo under a tmpl subdirectory
 - basic questions are asked of the user (ie: where are the source files?, which compiler?)
 - all template logic must be zero dependency and embedded in jfdi.py