Update v0.2.4

- Check for ball in saucer during attract 
- Updates to skillshot and drop mode target handling
- Ramp entrance toggle added to cellar mode
- Big updates to multiball and lock handling
- Initial code added for multi-player ball locking
- Better jackpot code
- Skyway now handles saucer when ramp up
- Spinning wheels now work when lock lit
- Updated flasher and kickout timings on cellar
- Adjusted effect schedule values