* First draft of factoring out the dropdown boilerplate
* Add proc macro for enum boilerplate
* Detect whether to say `crate` or the name
* Clean up the input and naming of the enum macro
* Rename a file
* Do the rename of code too
* Use the attribute-driven selection of radio vs dropdown
* Add a metadata struct and tooltips
* Move the new traits to a better place.
* Use ChoiceType, part 1
* Use ChoiceType, part 2
* Introduce a builder API for choice widgets
* Start using the new new API
* DomainWarpType should be a dropdown still
* Handle the case where a node property can never have a socket
* Rustfmt
* Code review
* Update stable node IDs in test
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Co-authored-by: Keavon Chambers <keavon@keavon.com>
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