Legacy function getMessageByteSize is overloaded and designed to handle now-deprecated encrypted msgs. It is also the last holdout still using the legacy generateOpReturnScript, which has been replaced by better functions in the src/opreturn directory.

Write a simpler function to get bytecount for Cashtab msgs. Add same unit tests as old function and some others.

Delete now unused functions getMessageByteSize and generateOpReturnScript.

Implement in Send.js

npm test
grep -r generateOpReturnScript src/ and no output