See #6 [0]. We don't use the CapsLock key actually in this extension,
but use the Menu key, which I personally then map the CapsLock to. A
rename would make it a lot clearer. We use names as captive in the
code as well, which means that this isn't trivial.

Scope:
    metadata.json
    documentation
        readme.md
        info in metadata
        urls
    code (menumaster, lowercase)
        directory name
        captive to active
    project
        name
        url
        urls in documentation

[0]: https://git.rensoliemans.nl/rens/captivate/issues/6

All code was replaced with replace-string in Emacs;
- captive -> active
- captivate -> activate