resultHandler to hazardExport refactor

src/org/opensha2/DeaggCalc.java

src/org/opensha2/HazardCalc.java

src/org/opensha2/calc/DeaggExport.java

src/org/opensha2/calc/Hazard.java

src/org/opensha2/calc/HazardExport.java

src/org/opensha2/calc/RateResultHandler.java