removed unused libraries

the libraries mockito, junit, logback and all dependencies were removed
implemented game logic

the new game logis is now implemented.
this commit contains:
-basic block controls lik turning and moving.
-gameover screen if game is lost
-code refactoring
added first release of the game
added colors to the blocks
resolved potential concurrency error

maybe concurrency led in some cases to an
ArrayIndexOutOfBoundsException, because the check for moving the block
down was wrong.