New test for reversed text
Way fancier test
Change "direction" option to "append"
Remove no-touchy rules on test-scene
Fix blank characters at end of old lines when resizing

The old behavior is not attainable (I didn't feel it was desirable enough to throw conditions into fitLines).
The next commit will probably remove opts.instant optionality altogether.

Contains tentative, non-working left and right append logic. Committing now because it's going to involve a lot of refactoring.
Add horizontal append behavior

I may restore something like opts.instant behavior in the future as opts.instantWidth and opts.instantHeight, since they're two very different cases.