feat: Update for complex fonts, rendering, and experimental high-level API

[PeterStaar-IBM]

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[cau-git]

I checked this with most of the known examples, and it appears to work much better!

However, there are other cases left where the output is still bad, I collected these below:

1. EL00820224CPARE.PDF - some text decodes with weird chars, e.g. Leilªo Pœblico instead of Leilão Público (expected), or Alienaçªo FiduciÆria instead of Alienação Fiduciária (expected). Note: pypdfium and Adobe Acrobat extract this correctly.
2. glyph_text.pdf - only glyph symbols are printed, in this form: /G42/G79/G82/G69/G68/.... Note: Adobe Acrobat fails at this too.
3. 050216e467d363616161fb79e2bfaa3e.pdf - many parts are glyphs, in a different form with pointy brackets and between char garbage: *OREDOLVLHUXQJGLYPH<3>LQGLYPH<3>GHUGLYPH<3>6SHLVHNDPPHU %DQGGLYPH<3>GLYPH<20>GLYPH<29>. Note: Adobe Acrobat fails at this too.

[cau-git]

We discovered one regression: Some cells come out with zero-height now.