Replaced SSF by numfmt (ECMA-376 support)

[juanparati]

I replaced SSF by numfmt the reasons what I did that is because SSF doesn't support custom localization features. To replace SSF by numfmt it will open the door to use custom localization features like number formats, currencies, etc.

Numfmt supports by default Chinese (traditional and simplified), Spanish and English among other locales.

[zyc9012]

@juanparati Thanks. This is a big change. I need to look into this deeply to ensure it doesn't break anything.