Simplify ThermalHouse

[sebastian-peter]

I'm not sure if these kinds of one-operation commands need to be placed in their own function:

simona/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala

Lines 225 to 229 in 5122684

	def calcNewInnerTemperature(
	oldInnerTemperature: Temperature,
	temperatureChange: Temperature,
	): Temperature =
	oldInnerTemperature + temperatureChange

Especially because this is not understandable at once glance:

simona/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala

Lines 210 to 213 in 5122684

	calcNewInnerTemperature(
	currentInnerTemperature,
	calcInnerTemperatureChange(thermalEnergyChange),
	)

But this could be, in my opinion:

    val temperatureChange = calcInnerTemperatureChange(thermalEnergyChange)
    currentInnerTemperature + temperatureChange

Same applies to methods calcInnerTemperatureChange, calcThermalEnergyChange and calcThermalEnergyGain. One could add explanatory commentary if and where needed.