Slots in wire node

[aconstlink]

As far I coded the wire node and slots separately. Now the slots need to go into the node so input and output slots can be created in the node.

Because the Lambda-node is the default one, there need to be a easy and efficient way to access the slots via the lambda function.

• the slots can be accessed through an index representing the order the slots were input
• a named access could be interesting too
• slot pointers could be captured in the lambda

In the end, slot access needs to be efficient because those are the "variables" of the node and need to be efficiently updated via the lambda. Accessing the slots through the slots' name, may not be the most efficient way.