GeezerVison

To test, run e.g.
```python
from pylab import *
set_loglevel("debug")
figtext(.5, .5, r"gff\textwon$\frac12$", usetex=True)
show()
```
Grab the path of the dvi file that appears last in the log, then run
```bash
python -mmatplotlib.dviread /path/to/dvi
```

Prior to this patch, the output was
```
=== new page === (w: 1668654, h: 553676, d: 225994)
font: 'cmss10'	scale: 0.625
x	y	glyph	chr	w	(glyphs)
983040	1441792	103	g	327681
1310721	1441792	11	.	382295
font: 'tcss1000'	scale: 0.625
x	y	glyph	chr	w	(glyphs)
1693016	1441792	142	.	618800
font: 'cmr7'	scale: 0.4375
x	y	glyph	chr	w	(glyphs)
2390459	1183756	49	1	261235
2390459	1667786	50	2	261235
x	y	h	w		(boxes)
2390459	1291058	26213	261235
```

With this patch, the output is
```
=== NEW PAGE === (w: 1668654, h: 553676, d: 225994)
--- GLYPHS ---
font: cmss10 (scale: 0.625) at /usr/local/texlive/2025/texmf-dist/fonts/type1/public/amsfonts/cm/cmss10.pfb
          x           y       glyph         chr           w
     983040     1441792         103           g      327681
    1310721     1441792          11           ff      382295
font: tcss1000 (scale: 0.625) at /usr/local/texlive/2025/texmf-dist/fonts/type1/public/cm-super/sfss1000.pfb
          x           y       glyph         chr           w
    1693016     1441792         142           ₩      618800
font: cmr7 (scale: 0.4375) at /usr/local/texlive/2025/texmf-dist/fonts/type1/public/amsfonts/cm/cmr7.pfb
          x           y       glyph         chr           w
    2390459     1183756          49           1      261235
    2390459     1667786          50           2      261235
--- BOXES ---
          x           y           h           w
    2390459     1291058       26213      261235
```

Most importantly, glyphs are now resolved to their unicode
representation (essentially by resolving the glyph name, similarly to
the process described in Text.glyph_name_or_index), whereas many complex
glyphs were just output as "." before.  Furthermore, full font paths are
printed, and the output is slightly better aligned.

These improvements will be more significant with the future support for
{xe,lua}tex, which can load a much wider variety of glyphs.