Only allow /RMG/Processes/Stepping/DaughterNucleusMaxLifetime in idle state

[ManuelHu]

• it is safe to use in idle state, too
• it is not registered yet in pre-init state in MT mode
• remove it from pre-init state to make macros behave consistently between MT/serial modes

this breaks all macros that used this option until now.. :-( but fixing is simple (just moving the command after /run/initialize)

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other options to fix these incosistencies:

• move the command to the physics messenger and read from the physics instance in the stepping action (might be slower?)
• initialize all (user) actions also on master, including Stepping-, Stacking-, TrackingActions... Currently we only have Run- and GeneratorActions on the master