Aiming aid is a personal preference now

What's new:
- Aiming aid is now a personal setting instead of a match property. This means everybody can select if he wants to play with or without aiming aid. Players with aiming aid can now play players without aiming aid.
- Aiming aid has now 3 level: Ghost ball + line, Ghost ball only, None
- 1 table is removed from the environment to generate more social interactions.