Support $config->scripts and $config->styles as arguments to CSS() and J...

Support passing of `$config->scripts` and `$config->styles` as arguments for
`AIOM::CSS()` and `AIOM::JS()` which are of type FilenameArray. Previously those standard ProcessWire variables could not be passed directly to AIOM.

This now allows to do this:

    <link rel="stylesheet" href="<?=AllInOneMinify::CSS($config->styles)?>">
    <script type="text/javascript" src="<?=AllInOneMinify::JS($config->scripts)?>"></script>