Prepare release 0.1.0.1

Make naming of pointers a bit more consistent

Prevent deletion of document before deletion of pages

Solves random segmentation faults, cf. https://todo.sr.ht/~geyaeb/haskell-pdftotext/4 .

Require at least standard C++11

Solves a problem with installing on MacOS, cf. https://todo.sr.ht/~geyaeb/haskell-pdftotext/3

Remove all mentions of xml-conduit flag

Polish CLI a bit

Add comment about making poppler quiet

Add CLI

Add PDF document properties

Add first version