Node Inputs Enhancement

[HeftyCoder]

Node Inputs are only allowed one connection. I'd argue that one should be able to define how many connections are allowed for a Node Input, i.e negative number for infinite and a positive number for constrained, which can be defaulted to 1.

I did notice that in ryvencore the graph_adj_rev relates one input to a single output, which means this implementation is ryvencore specific as well. I could look into the refactoring needed for this to work, but first I want to know:

• Is there a reason that an input takes only one output? Would data be lost otherwise? I can see how the design of connecting and the nodes updating on connection would favor ryven, but it probably limits ryvencore.
• Is this tightly coupled with the whole system, or could it be easy to change? I don't have a lot of time to spend on this, so an estimation on how much things might break will help me.

I hope I am right in saying that an input updating from a number of outputs can make sense.