SentimentUtils: Separate data and logic

[Chr1st1anSzech]

I would recommend to write all constants, words and other Information in ressource files, e.g. JSON or XML. That would support a more strict separation of data and logic. Furthermore, it simplifies i18n.

[codingupastorm]

Good idea - I wanted to first transcribe and make sure everything works but am happy to improve by moving the constants to resource files