Joint import from older versions of SCIA Engineer

As the BIM link is installed, a new menu IDEA StatiCa Connection containing two commands is added to the tab Steel. The Joint input command serves as to add a joint to the list of exported joints within the current SCIA Engineer project (displayed as the named mark in the 3D model), while the Check command opens the joint in IDEA StatiCa Connection in order to be designed and analyzed. If any changes in the SCIA Engineer model are applied afterward (e.g. adding load combinations), the Check command updates the changes in the IDEA StatiCa Connection model as well.