Add initialization of sub_openings
Predefine stack type name

so later code would be easier on the eyes
Add indentation for CASE statement

Recognize CASE/WHEN/THEN/ELSE/END as keywords
Change comment on print_spacing()

- Use '//' comments
- Improve wording
Enforce 80 column limit in print_keywords.h

Mostly move comments.
Some slight code changes were done to make code shorter.
While at it, comments in general were cleaned up.
Remove formatting.conf file from repository

It can be (is) generated by fsqlf anyway
Move variable declarations closer their usage
Add stack test file (were forgotten to commit)
Create `handle_kw()`, `handle_text()`

Additional level, needed to proceed with implementing
token queue for lookahead.
At the moment they just call `kw_print()` and `echo_print()`,
Plan is that
they will push_back onto the queue
then pass the queue to `kw_print()` and `echo_print()`
and handle token creation/allocation and destruction.
Move conf file reading into it's separate file
Make file names more consistent
Add testing gold-vs-lead