Revise connector locations in zone model icon

[jelgerjansen]

The location of connectors (input, output, HeatPorts, FluidPorts, bus) in the zone model icon (IDEAS.Buildings.Components.Interfaces.ZoneInterface.mo) should be revised due to the addition of some new connectors for the interzonal airflow features (e.g. #1327). This should be done before releasing a new IDEAS version.

One proposal would be to put all input connectors on the left, all output connectors on the right, and the HeatPorts and bus connector on the bottom. Furthermore, the FluidPorts can be removed since those are deprecated.