CRM-20600 - Move Angular metadata to civix-style files
This PR moves the metadata about Angular modules out of Civi\Angular\Manager and into standalone files (`ang/*.ang.php`). This uses the same structure as `civix`. Also, this makes it easier to navigate between the JS/HTML/CSS/PHP content. To test that these changes were safe, I ran the following command before and after this commit: $ cv ev 'var_dump(Civi::service("angular")->getModules());' The results were substantively identical.
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