GH-1927 Add more specific task status logging

* Tasks are now described by class name and object name (or memory address).
* Tasks starts are logged.
* Aborted tasks are now treated just as the other cases.

api/logic/minecraft/onesix/update/LibrariesTask.h

@@ -5,6 +5,7 @@ class OneSixInstance;
 
 class LibrariesTask : public Task
 {
+	Q_OBJECT
 public:
 	LibrariesTask(OneSixInstance * inst);