v0.13.0

 * Support 'swift_name' attributes on generated functions (#449)
 * Add [export.pre_body] to config (#452)
 * Handle new line in doc attribute (#454)
 * Add support for `Self` in tagged enums, structs and unions (#455, #455, #456)
 * Make sentinel variant respect regular config (#459)
 * Fix layout of tagged enums with size under some configurations (#463)
 * Add an option to allow configuring the order of function names in generated headers (#466)