Plugin manifest cleanup suggestions

[AndrewBelt]

• The name/brand of the plugin should include spaces, i.e. "Studio Six Plus One"
• You could link to individual module manualUrls, i.e. https://github.com/StudioSixPlusOne/rack-modules/blob/master/README.md#wallenda. See https://vcvrack.com/manual/Manifest#modules-manualurl

[curlymorphic]

@AndrewBelt
Thank you for the feedback, these changes shall be included in our next release.

On a side note, the individual plugin manual URLs are only used by the online library and not within Rack itself. I have confirmed this behavior with plugins authored by others.