[#62434202 #62433730]

* unicode-highlight-cache-62434202-62433730:
  Issue pull request for branch unicode-highlight-cache-62434202-62433730
  Escape, yet again, some gorram backslashes
  Fix the failing test
  Add failing test for weird code
  Unpack with the right encoding
  Write failing test for Unicode highlighting
  Refactor tralics switcher
Bump version number
Support PDF images in PDF output, PNG otherwise

[Delivers #62668410]
Issue pull request for branch 62668410-pdf-png

[Delivers #62668410](https://www.pivotaltracker.com/story/show/62668410)
[Delivers #62358298](https://www.pivotaltracker.com/story/show/62358298)
[Delivers #62352812](https://www.pivotaltracker.com/story/show/62352812)
Merge branch 'stable' into 62668410-pdf-png
Merge pull request #88 from softcover/62668410-pdf-png

62668410 pdf png