Allow copying of the nodes

Source discussion:

As a rule/process developer, I would like to click on a node (service task, dmn input node, etc), click CTRL+C and have the ability to copy the node by clicking CTRL+V on the canvas. This would insert the the node anywhere on the canvas, configured identically as the one copied.

This could useful when you start to model your DRG/BPMN,  and you have multiple (4-5) input fields required (or multiple tasks). This can help to speed up that initial modelling phase, by allowing you to quickly populate the required number of desired nodes.

Actual problem:

Copy-paste is not working on BC (7.x stream). Please see comments below.