\boldsymbol and new fonts

Going through the Asana font reminded me that the \boldsymbol extension adds some additional data to the FONTDATA array. Now that there are six new fonts, this data probably should be moved to the individual fontdata.js files rather than the boldsymbol extension file. That means the extension should be modified, and the needed variants moved or added to the fontdata files for the fonts (including the original TeX and STIX fonts).