I came across this question:
Which also was asked over here in a similair format:
But the answers over there are over 2 years old. So I assume there must be a better solution by now.
In short, is there? If so, please answer question at "Workflow for developing add-on/script". And refer to that answer in the answer here below. If there is not, please answer as well.
To rehearse the question.
Can Blender automatically reload external script files when they are changed?