First pass of bringing this code in line with the standard.

New REFILL/parse buffer logic.
Update to come closer to the standard.

Use PARSE and PARSE-NAME as they're supposed to be.
Now with -1 for TRUE, not 1.
Partially completed loading files at startup

Not building, just checking in to avoid losing work.
Basic workings are correct: reading from keyboard.
Fixed several bugs. Now reading correctly from multiple files.
Better error messages on unknown word. Fix multi-line comment.
Rewiring to support >IN. Working?
Fix the new-new (>IN-based) input technique.

Also now with working ." and friends. EVALUATE mostly works,
but it doesn't run the remainder of the definition it was called
from. Needs to be called into like a normal Forth word.
Now with working, nestable EVALUATE!
Tidy up CREATE, FIND and WORD to match the standard.
Adding STANDARD.md, detailing progress towards the standard.
Working(?) DOES>, fixed CREATE. CONSTANT, VARIABLE and ARRAY seem to work.
Add ENVIRONMENT?, LEAVE and a few other missing pieces.
Adding POSTPONE, MOVE, ['] and others.
Add LITCSTRING and C"
Adding ERASE and MARKER.
Add UNUSED, VALUE, TO. Sufficiently complete to carry on with.