List container improvements and testing

- support range based for loops
 - add remove() method to remove a node
 - add clear() to empty entire list and delete nodes
 - add empty() helper

src/modules/mavlink/mavlink_stream.h

@@ -43,14 +43,14 @@
 
 #include <drivers/drv_hrt.h>
 #include <px4_module_params.h>
+#include <containers/List.hpp>
 
 class Mavlink;
 
-class MavlinkStream : public ModuleParams
+class MavlinkStream : public ListNode<MavlinkStream *>
 {
 
 public:
-	MavlinkStream *next{nullptr};
 
 	MavlinkStream(Mavlink *mavlink);
 	virtual ~MavlinkStream() = default;