0.19.0

Features and enhancements

• [core] Implement variadic nodes. An ability to have an adjustable number of
  input pins on a node.
• [nodes] Nodes from the standard library made variadic if applicable: add,
  multiply, bitwise-*, any, and, or, concat, discretize,
  select, and others.
• [ide] Show richer tooltips on node hover. It shows the node label, fully
  qualified type, and errors if there are any.

New nodes

• xod/core/join