Release Notes:
- added poison food
- improved AI
- added hp bar animation
- [v1.12.1]: food spawn balanced as follow:
- standard food (+1hp) from 85% to 90%
- poison food (-9hp) from 10% to 5%
- bonus food (+3hp) 4%
- special food (+6hp) 1% - [v1.12.2]: changed poison damage from 9hp to 10hp
- [v1.12.3]: modified timed/endless mode label on the menu