mathtext.VectorParse now includes glyph indices

For a path-outputting MathTextParser, in the return value of parse, (a VectorParse), the glyphs field is now a list containing tuples of:

• font: FT2Font

• fontsize: float

• character code: int

• glyph index: int

• x: float

• y: float

Specifically, the glyph index was added after the character code.