remove polling of joystick button in player input because of missing fallback when joystick is not present
updated .gitignore file
Update README.md
flee and follow trajectories
Merge commit 'f95f9462d168fe3ae40e14492da9b0a5932ab3ec' into fbo

* commit 'f95f9462d168fe3ae40e14492da9b0a5932ab3ec':
  flee and follow trajectories
  Update README.md
  updated .gitignore file
  remove polling of joystick button in player input because of missing fallback when joystick is not present
  additional math functions