Improved conversion and UI
Improved conversion and UI

* ‹I› becomes upper or lower-case depending on whether it occurs at the
  start of a sentence
* Handling of hyphenated prefixes such as ‹re-›
* Integrated ArgumentParser for argument processing
* Unknown words can be counted and listed (work in progress)

ChristianSi/phoneng,ChristianSi/lytspel,ChristianSi/lytspel,ChristianSi/lytspel,ChristianSi/lytspel