Function alass::alass_format_is_supported

#[no_mangle]
pub extern "C" fn alass_format_is_supported(
    sub_path: *const c_char
) -> ResultCode

Determines whether the given subtitle is able to be synced

Support is indicated by either ALASS_IINI_SUCCESS, ALASS_UNSUPPORTED_FORMAT, or a more specific result code if a determination could not be made.