Restructure theme.php to define a class Theme
For various reasons, it's nicer to have a class for theme-file paths and such. So, I've rewritten the code for determining the locations of theme files to be more OOPy. I changed all the uses of the two functions in the module (theme_file and theme_path) to use Theme::file and Theme::path respectively. I've also removed the code in common.php that require's the module; using a class means we can autoload it instead.
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