The nodegraph inputs node can currently only have one wire connected per port

[manuelkoester]

See #24

Expected result:
It should be possible to connect to multiple pins per output on the nodegraph inputs node.

Actual result:
https://github.com/PrismPipeline/QuiltiX/assets/12091420/ef59ec15-2c3a-4f70-a168-6060cd9e0851