PAVÉS v0.3.2: More of a drop-in replacement for pdfminer

This enables a very lightweight port of pdfplumber to PAVÉS by adding various support classes and functions.

Also has some minimal visualization, which will be improved shortly.

And fixes a kind of serious bug in marked content section support for pdfminer emulation (not that you cared, since pdfminer didn't actually support marked content sections...)