best fit + fixes
- new feature: best fit (@GoncaloBastos)
- new example for best fit (@GoncaloBastos)
- bug fixes (@swingingtom)
- new font files (@felixmariotto)
new example link: https://felixmariotto.github.io/three-mesh-ui/#best_fit
new example link: https://felixmariotto.github.io/three-mesh-ui/#best_fit