Improved connection creation

Up until StruBIM Steel version 2023.g, StruBIM Steel's "Connection" tool allowed a connection to be created from a selection of bars.

As of version 2023.g, a connection can now also be selected as a pattern. After selecting the connection pattern, another group of bars can be selected to apply the same connection and, in addition, to group them together. To do this, with the bars selected, simply right-click to apply the connection pattern. This operation can even be repeated on another group of bars to apply the same connection again.