2a5f3bd1cc
Goals of the refactor: * Simplify adding (named) graph inputs and outputs. * Add ability to refer to a graph input or output with an index. * Get rid of the "dummy" terminology which doesn't really help. Previously, one would add "dummy nodes" which can then serve as input and output nodes of the graph. Now one directly adds input and outputs using `Graph.add_input` and `Graph.add_output`. There is one interface node that contains all inputs and another one that contains all outputs. Being able to refer to a graph input or output with an index makes it more efficient to implement some algorithms. E.g. one could have a bit span for a socket that contains all the information what graph inputs this socket depends on. Pull Request: https://projects.blender.org/blender/blender/pulls/112474
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