GTest functional tests that include parameters and uORB messaging (#12521)

* Add kdevelop to gitignore

* Add test stubs

* Rename px4_add_gtest to px4_add_unit_gtest

* Add infrastructure to run functional tests

* Add example tests with parameters and uorb messages

* Fix memory issues in destructors in uORB manager and CDev

* Add a more real-world test of the collision prevention

src/modules/uORB/uORBDeviceNode.hpp

@@ -56,7 +56,7 @@ class uORB::DeviceNode : public cdev::CDev, public ListNode<uORB::DeviceNode *>
 public:
 	DeviceNode(const struct orb_metadata *meta, const uint8_t instance, const char *path, uint8_t priority,
 		   uint8_t queue_size = 1);
-	~DeviceNode();
+	virtual ~DeviceNode();
 
 	// no copy, assignment, move, move assignment
 	DeviceNode(const DeviceNode &) = delete;