suggestion for ofTrueTypeFont for new characters introduced by ISO 8859-15

" In 1999, ISO needed to make the Euro currency symbol available. There were also a few other characters that were desired. So ISO created ISO-8859-15, which is identical to ISO-8859-1 except for 8 characters." [source: http://www.i18nqa.com/debug/table-iso8859-1-vs-iso8859-15.html]

ofTrueTypeFont shows the characters as they were in ISO-8859-1. A fix was added by @kylemcdonald at Jun 15, 2013 to support the euro sign but the other 7 characters that were introduced can be supported the same way by using the following code in ofTrueTypeFont::loadFont.

if (glyph == 0xA4) glyph = 0x20AC;   //  Currency Sign -> Euro Sign
if (glyph == 0xA6) glyph = 0x0160;   //  Broken Bar -> Latin Capital Letter S With Caron
if (glyph == 0xA8) glyph = 0x0161;   //  Diaeresis -> Latin Small Letter S With Caron
if (glyph == 0xB4) glyph = 0x017D;   //  Acute Accent -> Latin Capital Letter Z With Caron
if (glyph == 0xB8) glyph = 0x017E;   //  Cedilla -> Latin Small Letter Z With Caron
if (glyph == 0xBC) glyph = 0x0152;   //  Vulgar Fraction One Quarter -> Latin Capital Ligature OE
if (glyph == 0xBD) glyph = 0x0153;   //  Vulgar Fraction One Half -> Latin Small Ligature OE
if (glyph == 0xBE) glyph = 0x0178;   //  Vulgar Fraction Three Quarters -> Latin Capital Letter Y With Diaeresis

Start in ofTrueTypeFont::loadFont, where the existing Euro glyph handling is described. Verify the seven additional ISO-8859-15 mappings listed in the issue and confirm that the corresponding characters render correctly.