Update develop branch#12

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BurnySc2 wants to merge 8 commits intodevelopfrom

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Commits on Jan 24, 2020

renovating gkm's last commit by the use of kv files for UI
brookatlas
committed
screens finished and transition logic done, now only quiz logic is left to finish
brookatlas
committed

Commits on Jan 25, 2020

Make category "Medicine" work; highlight correct answer in green and wrong answer in red; read category questions and answers from "triviaQuestions/" directory
BurnySc2
committed