remove old, unneeded physicsHandler class from physics.h
remove old, unneeded physicsHandler class from physics.h

crystalline/openc2e,ccdevnet/openc2e,crystalline/openc2e,crystalline/openc2e,bdonlan/openc2e,crystalline/openc2e,ccdevnet/openc2e,bdonlan/openc2e,ccdevnet/openc2e,ccdevnet/openc2e,ccdevnet/openc2e,crystalline/openc2e,ccdevnet/openc2e,bdonlan/openc2e,bdonlan/openc2e