$entity_type argument removed from Field API functions and hooks dealing with a single $entity

The $entity_type argument has been removed from all Field API functions and hooks dealing with a single $entity (the $entity_type was generally passed as the first argument of the function).

It can now be accessed with $entity->entityType().

List of changed Field API hooks

hook_field_attach_form()
hook_field_attach_validate()
hook_field_attach_submit() (additionally renamed to hook_field_attach_extract_form_values() - see change notice)
hook_options_list()

List of changed Field API functions

field_attach_form()
field_attach_form_validate()
field_attach_submit() (additionally renamed to field_attach_extract_form_values() - see change notice)
field_view_value()
field_view_field()