[development] Strip out theme functions into a .theme file

[Morbus Iff]

> So, I'd propose replacing theme_foo() with foo.theme.  Such files would

For what it's worth, I'm against file-per-function, but don't
have time to get into it further right now. Maybe later. If
you hit me up on IRC, I can explain faster ;)

-- 
Morbus Iff ( if god is my witness, god must be blind )
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