Study version

Week 7.8-7.15
[X]- cart appears multiple times if clicked [add transfer state in FSM]
- 7/8
[X]- change pressure of boiler goes to 80 before 120 on renewal - 7/8
[X]- the pipe should disappear if used in practice mode - 7/13
[X]- fullscreen mode does not leave ghost image [do not use the
MainWindow for player 1] - 7/13
[X]- everything is parented to factory to avoid appearing in MainWindow
- 7/13
[X]- add olive oil counting sound and winning sound - 7/13
[X]- hide the light quads - 7/14
[X]- enlarge the proximity sensors for the barrow and the pipe - 7/14
[ ]- update machines with merged models (boiler, mill, engine)