undo: implement renaming of events

There is a slight complexity here owing to the fact that the profile
works on a copy of the current dive: We get a copy of the event and
have to search for the original event in the current dive. This
could be done in the undo command. Nevertheless, here we do it in
the profile so that when in the future the profile can work on a
non-copied dive we can simply remove this function.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

commands/command_event.h

@@ -58,6 +58,18 @@ public:
 	AddEventSetpointChange(struct dive *d, int dcNr, int seconds, pressure_t pO2);
 };
 
+class RenameEvent : public EventBase {
+public:
+	RenameEvent(struct dive *d, int dcNr, struct event *ev, const char *name);
+private:
+	bool workToBeDone() override;
+	void undoit() override;
+	void redoit() override;
+
+	OwningEventPtr eventToAdd;	// for undo and redo
+	event *eventToRemove;		// for undo and redo
+};
+
 } // namespace Command
 
 #endif // COMMAND_EVENT_H