xcode
PRP2-A3: festoFunctions v1.4.0

new functions saveActors and retoreActors
PRP2-A3: listDatabase v0.3 (safety)

many NULL-pointer safety added,
TODO: outputList and deleteLast
PRP2-A3: stateMachine v2.0 (yey!) with ESTOP and list

more beautiful stateMachine with exercise 3 requirements. Without the
timing crap. ESTOP implemented!!!

updated read me and main