- https://stackoverflow.com/questions/44895551/custom-language-generator-to-blockly
- https://blocklycodelabs.dev/codelabs/validation-and-warnings/index.html?index=..%2F..index#2
- https://stackoverflow.com/questions/14010515/javascript-remove-everything-from-string-but-hex
- https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/number#json
- https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/text-input
- https://developers.google.com/blockly/guides/create-custom-blocks/fields/validators