[development] Move multiple theme per site support to contrib module

[Morbus Iff]

> We should simply remove the 'enabled' checkbox, and rename the default 
> radio to 'enable'.

This then causes problems for useful configurations, I'd think, like 
"theme this section differently" (sections.module) or "theme admin 
differently than the rest of the site" which, I think, both assume that 
the themes available are those that are enabled.

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