Make SvNumberFormatter's methods non-inline.

This is a high-impact header, included by hundred's of source files.

Change-Id: I2b7f1c9e8ffe81ddccd1a541e3474ca302a27e90
Make NfCurrencyTable a separate header & forward-declare it in zforlist.hxx.

Change-Id: I17b52c277ab6ec8b15e88729feee0a269b75087d