* Send stack trace to the UI on prod mode
* Pdfs will now generate cover images. I missed something a few releases ago.
* Ignore @Recently-Snapshot directories for QNAP.
* Refactored Bitmap code to use ImageSharp so it's truly cross platform.
* Updated pdf extraction to use a multi-threaded approach to greatly speed up pdf image extraction
* Hooked in Characters tag from ComicInfo.xml