Copy & Paste all items

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Copy & paste rewrite

• Adds support for groups & reroutes
• Remaps links & reroutes, maintaining connections
• Fixes bug where pasted node links could be corrupted / lost by one bad node entry

copy-pasta-all.mp4

Overview of changes

• All items are run through serialize or asSerialisable
• All links to the inputs of copied nodes are included
• Nodes are still cloned as this behaviour is relied on in places, however original IDs are reinserted and copied
• Links use the new Serialisable interface, serialising them as objects like everything else
• Re-linking and ID mutation only occurs when pasting
• Paste returns map of original IDs to pasted items (_paste method only, at present - public API later if no issues)

This should provide a much cleaner way to extend and utilise Litegraph's copy and paste.

Requires

• Add Reroutes #301
• Decouple group node from Litegraph copy & paste ComfyUI_frontend#1522
• Update Template copy & paste ComfyUI_frontend#1533

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Edit: Resolved

Part of the rewrite was removing a workaround in Litegraph (a new, disparate format for links). groupNode reads directly from the copy / paste system's internal workings, so is now failing tests. Looking at it now.