feat: Provide way to have a clean copy of the table

[ranma2913]

When copying directly from the website into tools like Atlassian Confluence the input for the Note messes up they paste result. elements are not well handled.

I'd like to have a way to get a clean html table copy of the rendered subnet split.

[ranma2913]

#40 adds a new option in the tools menu:

which will produce a clean copy-paste: