Change how death is handled

[yancouto]

As of now, walking into lava/laser kills you right away, but it would be better if death was checked only on te end of turn (there is even a function for that already!). Then for example level franz1 could work without having to change any additional code.

[rilifon]

It would be nice to enable animations for each type of death. For instance, lava or laser could just desintegrate the robot; code finishing before objetive is completed, or pressing the stop button could make the floor beneath the robot open