My prayers have been answered! Bill Murray, Dan Akroyd, Ernie Hudson and Harold Ramis are jumpsuiting back up for another “Ghostbusters” movie! But while it was hard enough for them to fend off Vigo and the Marshmallow Man back in the ’80s, now that the paranormal paratroopers qualify for AARP, they’re looking to hand over the keys to the Ectomobile to the next generation of nerds. And we know exactly who we want to have in the driver’s (and back) seat, so casting agents know the answer to “Who ya gonna call?”…