Thermal sensors need outputs

[jbatteh]

Is your feature request related to a problem? Please describe.

The sensor components in the MTK Thermal library do not have output connectors. Thus they cannot be wired to other components as expected (i.e. PID, etc.). This request applies to TemperatureSensor, RelativeTemperatureSensor, and HeatFlowSensor.

Describe the solution you’d like

The sensed variables should be added to a RealOutput component.

Describe alternatives you’ve considered

A clear and concise description of any alternative solutions or features you’ve considered.

Additional context

For reference, you can look at Modelica Standard Library (i.e. Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensor)

[bavcol]

When using the sensor components of MTK Electrical, I noticed those are missing the output port as well.
If I find the time, I will create a pull request for those as well.