Rasterizer:hasGlyphs
Checks if font contains specified glyphs.
hasGlyphs = Rasterizer:hasGlyphs( glyph1, glyph2, ... )
glyph1 string or number Glyph
glyph2 string or number Glyph
... string or number Additional glyphs
hasGlyphs boolean Whatever font contains specified glyphs.