connect not connected ports

[DaJansenGit]

Problem

Currently, if no connection between ports exist and these ports are not positioned close to each other in the IFC, there is no method to connect the related components in the graph of bim2sim.

Solution

We could add some code in the decide_dead_ends() function else part, where we ask the user to connect pairs of ports.

Use case

This is needed, because for the VDI 3805 based system exports via CARF we get a IFC, where the ports that should be connected are not positioned close to each other. If there is a fault in the export, we have currently no way to connect their corresponding bim2sim elements.