Travis CI: Fix (SFML Version in Ubuntu Repo alt) 6

Travis CI: Fix (SFML Version in Ubuntu Repo alt) 7

Travis CI: Fix (SFML Version in Ubuntu Repo alt) 8

Travis in Readme

Travis CI: Fix (SFML Version in Ubuntu Repo alt) 9
Travis CI: Fix (LLVM -> gcc)

Travis CI: Fix (LLVM -> gcc) 2

Unnötige apt ** braucht Enter zum Bestätigen

Travis CI: Fix (LLVM -> gcc) 3

Travis CI: Fix (LLVM -> gcc) 4

Travis CI: Fix (LLVM -> gcc) 5