HOLY FUCKING SHIT IT WORKS.

Oh, right, except I ignored letter-spacing and word-spacing, so there's
that.
* There is a bug in which tightfit assumes the text is NOT wrapped and
should be kept as it is, thus the ratio is calculated accordingly. This
should be fixed in a future patch since it makes no sense.
* Added an error factor. This factor becomes the multiplier of the final
size.