Postpone ejects when targets are conflicting
Postpone ejects when targets are conflicting

Two ball devices connected to the same diverter can only eject at the
same time when targeting the same side of the diverter. When not the
second eject gets postponed and resumed after success or failure of the
first eject.

spierepf/mpf,qcapen/mpf,missionpinball/mpf,qcapen/mpf,missionpinball/mpf,spierepf/mpf