Refactor - Change python variable names in single.tsx to snake_case

[AdamFinkle]

For example

            summaryInputFromJs = summaryInputJs.as_object_map().values()._mapping
            temperatureInputFromJs =temperatureInputJs.as_object_map().values()._mapping
            # We will just pass in this data
            naturalGasInputRecords = parser.parse_gas_bill(csvDataJs, parser.NaturalGasCompany.NATIONAL_GRID)
            design_temp_looked_up = helpers.get_design_temp(state_id, county_id)
            summaryInput = SummaryInput( **summaryInputFromJs, design_temperature=design_temp_looked_up)
            summaryInput = HeatLoadInput( **summaryInputFromJs, design_temperature=design_temp_looked_up)
            temperatureInput = TemperatureInput(**temperatureInputFromJs)