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This is an attempt to improve the Router GUI: Get away with cryptic block coordinates & channel indices, count up Controller numbers and use 1-based channel numbers that correspond to the Controller GUI, instead.
The head commit is only meant as a suggestion, but everything up to it seem reasonable to me.
Before:

After 8d1b9ca:

After 9e9df43:

Please bear with me as this is the first time I've coded for a Minecraft mod.