Fix all build warnings

[knmcguire]

Usually we are quite lenient with build warnings, but sometimes these warnings are actually useful, like this warning in Jazzy that predicted build errors in Rolling:

warning: ‘typename rclcpp::Service<ServiceT>::SharedPtr rclcpp::Node::create_service(const std::string&, CallbackT&&, const rmw_qos_profile_t&, rclcpp::CallbackGroup::SharedPtr) [with ServiceT = std_srvs::srv::Empty; CallbackT = std::_Bind<void (CrazyflieROS::*(CrazyflieROS*, std::_Placeholder<1>, std::_Placeholder<2>))(std::shared_ptr<std_srvs::srv::Empty_Request_<std::allocator<void> > >, std::shared_ptr<std_srvs::srv::Empty_Response_<std::allocator<void> > >)>; typename rclcpp::Service<ServiceT>::SharedPtr = std::shared_ptr<rclcpp::Service<std_srvs::srv::Empty> >; std::string = std::__cxx11::basic_string<char>; rmw_qos_profile_t = rmw_qos_profile_s; rclcpp::CallbackGroup::SharedPtr = std::shared_ptr<rclcpp::CallbackGroup>]’ is deprecated: use rclcpp::QoS instead of rmw_qos_profile_t

Then we can catch anything that gets deprecated in later ROS distro releases.