Implemented pause logic.
I implemented pause logic and added an indicator, which shows, which sorting algorithm is currently active. The pause logic was quite painful, cause it just didnt want to stop. Neither with break, nor with return. After a long long long trouble shooting session, I found out, that I forgot .current and it just wont detect correctly, what a stupid bug to troubleshoot 20 min for. Also I fixed an edge case in the demo vid xD