add delta T specification for heat exchangers

[EvenSol]

Is your feature request related to a problem? Please describe.
add delta T specification for heat exchangers - at the moment only UA specification is supported.

[EvenSol]

Task wil be to modify the method to use a delta temperature sepcification (we should be able to select if UA or delta T specification is used).

neqsim/src/main/java/neqsim/processSimulation/processEquipment/heatExchanger/HeatExchanger.java

Line 264 in 1275400

public void run(UUID id) {

@Sviatose and @AndreasHNyhus something we can discuss.