Move MpdGeneralGenerator
MpdGeneralGenerator needs to be untangled from shield_pack and put inside simulation/generators. Also dependency on PLUTO has to be removed since we are not building MPDRoot with PLUTO included.
MpdGeneralGenerator needs to be untangled from shield_pack and put inside simulation/generators. Also dependency on PLUTO has to be removed since we are not building MPDRoot with PLUTO included.