(NFC) (#878) Simplify copyright header (api/*)

api/v3/Acl.php

api/v3/AclRole.php

api/v3/ActionSchedule.php

api/v3/Activity.php

api/v3/ActivityContact.php

api/v3/ActivityType.php

api/v3/Address.php

api/v3/Attachment.php

api/v3/Batch.php

api/v3/Campaign.php

api/v3/Case.php

api/v3/CaseContact.php

api/v3/CaseType.php

api/v3/Constant.php

api/v3/Contact.php

api/v3/ContactType.php

api/v3/Contribution.php

api/v3/Contribution/Transact.php

api/v3/ContributionPage.php

api/v3/ContributionProduct.php