Reformat the codebase

CLDR aims to be an independent library, but follows Drupal coding standards instead of PSR1/PSR2.

Here's a first pass at reformatting. Should be safe to merge as is.

We also need to rename "CLDR" to "Cldr" (assuming that name should be kept, CLDR does have a much wider purpose/data set than just formatting numbers), but that can be done later.